June 2019最新文献_第3页

Biological control of white mold (Sclerotinia sclerotiorum) in lettuce using Brazilian Trichoderma spp. strains 利用巴西木霉菌株对生菜菌核白霉的生物防治

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1214

G. D. Silva, L. I. Heckler, M. R. Durigon, R. F. Santos, Maike Lovato, G. Finger, E. Blume

{"title":"Biological control of white mold (Sclerotinia sclerotiorum) in lettuce using Brazilian Trichoderma spp. strains","authors":"G. D. Silva, L. I. Heckler, M. R. Durigon, R. F. Santos, Maike Lovato, G. Finger, E. Blume","doi":"10.21475/AJCS.19.13.06.P1214","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1214","url":null,"abstract":"Widely consumed by the Brazilian, lettuce has a cultivated area of 35,000 ha. Among the diseases that might infect this crop, white mold causes major concerns for producers. Mold is caused by the fungus Sclerotinia sclerotiorum (Lib.) de Bar. It can lead to losses of up to 100% in lettuce. The objectives of this study were assessment of antagonistic effect of Trichoderma spp. isolates, grown and prepared on rice grain, on white mold of lettuce (S. sclerotiorum). The assay was conducted using 12 Trichoderma spp. isolates, four of which came from at least a year of storage at 4ºC, four from areas with a history of the disease and four from areas without a history of the disease. Both fungi were grown on wet rice grains and only Trichoderma strains was dried and ground to be used in the next assay. The experiment was completely randomized in a factorial 12x2 design (Trichoderma spp. × substrate inoculated or not with S. sclerotiorum) and control plants without any of the fungi. The percentage of survived plants was analyzed using AUDPC, number of leaves, stem diameter, length of root system, fresh and dry weight of shoot and root, and total dry matter. The results showed that all Trichoderma spp. were capable of lettuce growth promotion in the presence and absence of S. sclerotiorum. The isolates that showed the best biocontrol of S. sclerotiorum were TC1.15 and WM-13. To promote growth, the best isolates were UFSMT15.1 and WM-13, suggesting that the latter presents desirable characteristics for biocontrol, including excellent feasibility for large-scale production, good antagonistic activity to S. sclerotiorum and the ability to stimulate growth promotion in lettuce.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126847853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Upland rice gas exchange, nutrient uptake and grain yield as affected by potassium fertilization and inoculation of the diazotrophic bacteria Serratia spp. 施钾和接种重氮营养菌沙雷氏菌对旱稻气体交换、养分吸收和产量的影响

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1689

A. Nascente, M. Filippi, T. P. Sousa, A. A. Chaibub, A. D. Souza, A. C. Lanna

{"title":"Upland rice gas exchange, nutrient uptake and grain yield as affected by potassium fertilization and inoculation of the diazotrophic bacteria Serratia spp.","authors":"A. Nascente, M. Filippi, T. P. Sousa, A. A. Chaibub, A. D. Souza, A. C. Lanna","doi":"10.21475/AJCS.19.13.06.P1689","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1689","url":null,"abstract":"Potassium (K) is the second most uptaken nutrient by upland rice crops. Beneficial microorganisms, such as Rhizobacteria participate in different processes that affect transformation of soil nutrients, making them available to plants. However, there are no information about the use of Rhizobacteria and different rates of K fertilization in this crop. To elucidate this interaction, the objective of this study was to determine the effect of the rhizobacteria Serratia spp. strain BRM 32114 and doses of K at sowing fertilization on upland rice development. The experimental design was a complete randomized block in a factorial 4 × 2 scheme with four replications, under no-tillage systems conducted in the Brazilian Cerrado during 2015/16 and 2016/17 growing seasons. The treatments consisted of four K2O doses (0, 20, 40 and 60 kg ha-1) without or with rhizobacteria applied three times in the field (on the seeds, sprayed over the soil, seven days after sowing and sprayed on the plants, 14 days after sowing). Biomass production, gas exchange, nutrient content in leaves and grain, yield components and grain yield were evaluated. The use of BRM 32114 applied in soil with high levels of K provided increase in the contents of P, Ca, Mg, Fe and Zn in rice leaves. The results showed enhances in plant biomass (7.2%), the number of panicles per plant (10%), and the grain yield of upland rice (16.3%). Therefore, our results allow inferring that the use of microorganism BRM 32114 provided significant improvements in rice growth/development, which resulted in higher grain yield over two consecutive growing seasons under field conditions. It showed that the bioagent Serratia spp. is promising to be incorporated into crop systems.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129882515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Resistance elicitors and defense response enhancers of maize to Spodoptera frugiperda (J.E.Smith) (Lepidoptera: Noctuidae) 玉米对褐夜蛾(鳞翅目:夜蛾科)的抗性激发子和防御反应增强剂

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1945

Janaina Marques Mondego, R. Lemos, Jacinto de Luna Bastista, D. Vieira, K. M. S. Pinto, A. A. Rodrigues, P. A. F. R. Melo, E. A. Costa, M. Mesquita, A. S. Rêgo

{"title":"Resistance elicitors and defense response enhancers of maize to Spodoptera frugiperda (J.E.Smith) (Lepidoptera: Noctuidae)","authors":"Janaina Marques Mondego, R. Lemos, Jacinto de Luna Bastista, D. Vieira, K. M. S. Pinto, A. A. Rodrigues, P. A. F. R. Melo, E. A. Costa, M. Mesquita, A. S. Rêgo","doi":"10.21475/AJCS.19.13.06.P1945","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1945","url":null,"abstract":"The objective of this research was to assess the potential of abiotic compounds as defense response enhancers in maize using enzymatic quantification and their efficiency in reduction of damages caused by S. frugiperda. The experiment was laid out in a randomized complete block design with six treatments and five replications. The treatments were: T1: positive control (distilled water + infestation); T2: negative control (without product application, uninfested); T3: biofertilizer; T4: acibenzolar-S-methyl (ASM); T5: potassium silicate; T6: potassium silicate + ASM. The treatments were applied in V6 stage of maize plants. After five days, the plants were artificially infested with 2nd instar caterpillars of S. frugiperda. Damage assessments were carried out at 4, 8, 16 and 22 days after infestation using a scale of notes. To evaluate the enzymatic activity, one leaf of each plant was removed at 2, 4, 8, 16 and 22 days after infestation. The largest peroxidase activities were observed at two DAI (days after infestation) using the potassium silicate + ASM (2,344.12 UAE.mg-1 of proteína.min-1) treatment, while the larger polyphenol oxidase activity peaks were observed after treatment with ASM at 22 DAI. The application of potassium silicate + ASM in corn plants can promote peroxidase activity. The polyphenol oxidase activity was increased after application of ASM, whereas the presence of the pest (on positive control) could potentially increase the activity of phenylalanine ammonia-lyase. The applications of ASM alone and potassium silicate + ASM contributed to reduction of the foliar damage level caused by S. frugiperda in corn plants.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"802 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117045952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Flowering gene expression in Indonesian long harvest black rice (Oryza sativa L. ‘Cempo Ireng’) 印尼长收黑稻开花基因的表达

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1588

Y. A. Purwestri, F. Susanto, Anis Fauzia

{"title":"Flowering gene expression in Indonesian long harvest black rice (Oryza sativa L. ‘Cempo Ireng’)","authors":"Y. A. Purwestri, F. Susanto, Anis Fauzia","doi":"10.21475/AJCS.19.13.06.P1588","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1588","url":null,"abstract":"Many studies have reported the great potency of black rice as functional food for human diet. Cempo Ireng is one of Indonesian black rice cultivars with the highest content of anthocyanin. However, it also suffers from long harvest period. This experiment aims at investigating the behavior of the flowering genes in order to gain basic information to develop this cultivar. We sampled the leaves’ blades of Black Rice ‘Cempo Ireng’ at 48, 55, 68, 81, and 90 DAP then performed RNA isolation and cDNA synthesis, amplification of targeted flowering genes, and a semi-quantitative analysis to see the expression of flowering genes. Our results showed that the flowering genes Hd3a and RFT1 were redundantly up-regulated to induce flowering in black rice Cempo Ireng under a neutral day condition in a tropical region. We also noted that the patterns of FT-like genes and flowering regulatory genes including FT-L5, FT-L6, FT-L9, FT-L10 and Hd1, OsCOL4 were expressed together with two major flowering genes. FT-like genes were temporally co-expressed with two flowering genes Hd3a and RFT1, whereas the Hd1 had a unique expression pattern. Meanwhile, OsCOL4 as the flowering repressor was only detected in the early stage when the flowering gene Hd3a began to express. The results suggest that black rice Cempo Ireng has similar and conserved flowering pathway under a neutral day condition as indicated in the common rice flowering models.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114487212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Addition of essential oils and inulin for production of reduced salt and fat ham 添加精油和菊粉用于生产减盐和减脂火腿

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P943

Rosicleide dos Santos Silva, A. D. S. Lima, Leandro Paulo da Silva, Robson do Nascimento Silva, E. Pereira, Fernando Luiz Nunes de Oliveira, Geíza Alves Azerêdo

{"title":"Addition of essential oils and inulin for production of reduced salt and fat ham","authors":"Rosicleide dos Santos Silva, A. D. S. Lima, Leandro Paulo da Silva, Robson do Nascimento Silva, E. Pereira, Fernando Luiz Nunes de Oliveira, Geíza Alves Azerêdo","doi":"10.21475/AJCS.19.13.06.P943","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P943","url":null,"abstract":"It has been estimated that approximately 75% of the human’s sodium intake is added during industrial manufacturing. Processed meats can also contain relatively high amounts of saturated fats, and high levels of fat, associated with increased risk of obesity, diabetes and cancers, especially colon cancers. In contrast, dietary fiber intake (ex. inulin) has been associated with health benefits, including a suggested protective effect against colorectal cancer due to an inverse association with colorectal cancer risk. Nutritional and health concerns indicate that consumption of these two elements should be reduced. This study aimed to develop a ham with reduced levels of salt and fat. We added essential oils of oregano and rosemary to preserve the ham as a substitute for fat, for which inulin was also added. Six ham formulations were prepared (control, fat reduction + inulin, salt reduction, salt reduction + essential oils, salt reduction + no fat, and salt reduction + no fat + essential oils). The physical-chemical and microbiological quality parameters were evaluated. The addition of inulin did not interfere with the chemical composition of the formulated ham, presenting itself as a promising alternative for reducing the addition of fat in baked ham. The administration of essential oils in combination caused a significant decrease in native flora of cooked ham. These results suggest that a combination of essential oils and inulin may be a promising alternative in the production of meat products with lower salt and fat levels.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114171610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Influence of bunch bagging on the development of banana Prata (AAB) and prevention of chilling injury in the field 捆套袋对香蕉果实发育及田间冷害防治的影响

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1641

J. D. Lima, D. Rozane, E. Gomes, Silvia Helena Modenese Gorla da Silva, W. Moraes, R. Kluge

{"title":"Influence of bunch bagging on the development of banana Prata (AAB) and prevention of chilling injury in the field","authors":"J. D. Lima, D. Rozane, E. Gomes, Silvia Helena Modenese Gorla da Silva, W. Moraes, R. Kluge","doi":"10.21475/AJCS.19.13.06.P1641","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1641","url":null,"abstract":"Banana is extremely sensitive to chilling injury (CI). It shows symptoms of peel browning at approximately 12°C and severe symptoms at 6°C. The purpose of this study was to investigate the influence of different bagging materials on development of banana bunch (Musa spp. AAB cv. Prata) and preventing CI in field. The study was carried in Jacupiranga, São Paulo, Brazil, in a completely randomized design in 2 × 9 factorial, in which treatments were two years of formation of bunch and nine bagging materials, with eight replicates. Bagging was performed in the autumn and winter to ensure the occurrence of CI in the field, and the evaluations after harvesting and fruit maturation. The bagging materials consisted of blue transparent polyethylene, white non-woven fabric, white opaque polyethylene, bubble wrap, white laminated non-woven fabric, double paper, blue transparent polyethylene plus kraft paper, blue transparent polyethylene plus white non-woven fabric and non-bagged. In 2013, the bunches of were exposed to 182.02 h of temperatures lower than 12C and 5.25 h of temperatures lower than 5C, while in 2014, only 70.76 h of temperatures lower than 12C was provided. Bunches formed in 2013 had longer exposure periods between flowering and harvest due to the low temperatures, but exhibited higher mass than those formed in 2014. The CI index was only 1.38 in 2013 and 1.00 in 2014 (p<0.05). On the colder days of 2013 and 2014, bagging raised peel temperature 1.91 and 3.17°C, respectively. The bagging material influenced yield, the accumulation of nutrients in fruits and the hue angle of peel. Double paper promoted fruits with more yellow peel.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124243259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Physiological maturation and postharvest resting of papaya fruits and seeds in agroecological transition 农业生态转型中木瓜果实和种子的生理成熟和采后休息

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1799

J. C. F. M. Junior, L. D. F. D. A. Melo, L. P. Rezende, V. M. Ferreira, J. C. A. Neto, V. G. D. Silva, R. D. A. Paes, L. Chaves, P. C. Souto, Rayza Verissimo Cavalcante da Silva

{"title":"Physiological maturation and postharvest resting of papaya fruits and seeds in agroecological transition","authors":"J. C. F. M. Junior, L. D. F. D. A. Melo, L. P. Rezende, V. M. Ferreira, J. C. A. Neto, V. G. D. Silva, R. D. A. Paes, L. Chaves, P. C. Souto, Rayza Verissimo Cavalcante da Silva","doi":"10.21475/AJCS.19.13.06.P1799","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1799","url":null,"abstract":"This study aimed to characterize the maturation stages of the papaya fruits and to evaluate the physiological quality of papaya seeds produced in an agroforestry system as a function of postharvest maturation. Papaya fruits were used (Carica papaya L.) from two groups, Formosa Tainung 1 and Solo Sunrise Solo, harvested at maturation stage I (up to 15% of the yellow bark). The seeds were obtained, without sarcotesta: soon after harvest (T1); 14 days after standing at room temperature (T2); and 14 days after standing at 10 °C (T3). The variables analyzed included: germination, first count, speed, and mean germination time and length of seedlings. The experimental design was completely randomized, in a 2 × 3 factorial scheme (2 groups and 3 rest periods), with 4 replicates of 50 seeds for each treatment. The papaya fruits produced maximum germinating seed in a less average time at room temperature and maturation stage V and the final stage (76%–100% of the yellow bark), allowing maximum number of seedlings with greater vigor. Fruits in stage I impaired the physiological quality of the seeds. The agroecological production presented a systemic approach in the management of papaya.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129334528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of organomineral fertilizers sourced from filter cake and sewage sludge can affect nutrients and heavy metals in soil during early development of maize 从滤饼和污泥中提取有机肥可以影响玉米发育早期土壤中的养分和重金属

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1538

Mara Lúcia Martins Magela, R. Camargo, R. Lana, Melissa Cristina de Carvalho Miranda

{"title":"Application of organomineral fertilizers sourced from filter cake and sewage sludge can affect nutrients and heavy metals in soil during early development of maize","authors":"Mara Lúcia Martins Magela, R. Camargo, R. Lana, Melissa Cristina de Carvalho Miranda","doi":"10.21475/AJCS.19.13.06.P1538","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1538","url":null,"abstract":"This study determined the changes in soil nutrients, organic carbon, organic matter and heavy metals during the early development stages of maize fertilized with different sources and doses. Also, this study confirmed that the used biosolid in the formulation of organomineral fertilizer makes greater efficacy than the effects promoted by mineral or filter cake organomineral fertilizers already used in agricultural. The experiment was done in a greenhouse at the Federal University of de Uberlândia - Campus Umuarama. The experimental design was randomized block design, as a 2 x 5 + 2 factorial, containing two sources of organomineral fertilizer consisting of organic residues (biosolid and filter cake), five doses of organomineral fertilizer (60, 80, 100, 120 and 140% of P2O5 recommendation for maize crop), a positive control with mineral fertilization (100%) and a negative one with no fertilization with four replications. The soil pH and contents of phosphorus, potassium, calcium, magnesium base saturation, base sum, micronutrients, organic carbon, organic matter and heavy metals were determined subsequently after plant removal, 65 days after sowing. The organomineral fertilizers based on biosolid and filter cake yielded increases in phosphorus, boron and manganese in the soil, especially the biosolid source. Regardless of the fertilizer organic matter source, soil phosphorus increased linearly with increasing doses of the sources. Doses equal or below the recommendation for maize (100% P2O5) were less effective in supplying potassium. The organomineral sources did not add heavy metals to the soil. Fertilizers based on biosolid can supply nutrients, such as phosphorus, boron and manganese at high doses, replacing mineral fertilization, while maintaining and improving soil fertility with no contamination by heavy metals.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134453590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Productivity and establishment of DRIS indexes for cultivation of potato cultivar Asterix tubers in a dystrophic Red Latosol 在营养不良的红壤中种植马铃薯品种 Asterix 块茎的生产率和建立 DRIS 指数

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1381

Angélica Araújo Queiroz, A. F. Cardoso, C. O. Silva, R. Camargo, R. M. Q. Lana, J. M. Luz

{"title":"Productivity and establishment of DRIS indexes for cultivation of potato cultivar Asterix tubers in a dystrophic Red Latosol","authors":"Angélica Araújo Queiroz, A. F. Cardoso, C. O. Silva, R. Camargo, R. M. Q. Lana, J. M. Luz","doi":"10.21475/AJCS.19.13.06.P1381","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1381","url":null,"abstract":"The potato culture has the highest relative demand for fertilizers per unit area, around 2.3 to 2.8 t ha-1. The objective of this study was to evaluate the productivity of a potato Asterix cultivar subjected to different doses of nitrogen, phosphorus, and potassium, and to establish the DRIS index according to productivity results. The experimental design was randomized blocks, with 5 rates and 4 replicates for each nutrient totalizing 20 plots per experiment. The rates of nutrients were: nitrogen (0, 70, 140, 210 and 240 Kg ha-1); phosphorus (0, 200, 400, 600 and 800 kg ha-1) and potassium (0, 150, 300, 450 and 600 kg ha-1). For leaf diagnosis by the DRIS index, 10 complete leaves of the third expanded trifoliate were collected. The DRIS standards calculations were based on populations of high productivity (or reference) and low productivity. Plants whose productivities were greater than 22 t ha-1 represented the groups of reference. It was concluded that productivity was not influenced by the P and K doses studied, with an increase in yield of tubers as a function of the N rates applied, up to the dose of 173 kg ha-1 of N. According to the DRIS index, it is possible to establish the order of limiting nutrients for failure in descending order in areas with high productivity Ca> Mn> P> S> Zn = Cu> K> N> B> Fe> Mg, and the order of limiting nutrients in areas of low productivity Ca> Cu> Mg> P> S> Mn> Zn> K> Fe = B> N. The results showed that productions above 22 t ha-1 need adjustments of the soil fertility managements.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129768682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Short-term effects of liming on chemical attributes of tropical sandy soil and soybean (Glycine max L.) yield 石灰化对热带沙质土壤化学特性及大豆产量的短期影响

June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1614

M. E. Neto, C. F. Coneglian, A. C. S. Costa, T. T. Inoue, M. A. Batista

{"title":"Short-term effects of liming on chemical attributes of tropical sandy soil and soybean (Glycine max L.) yield","authors":"M. E. Neto, C. F. Coneglian, A. C. S. Costa, T. T. Inoue, M. A. Batista","doi":"10.21475/AJCS.19.13.06.P1614","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1614","url":null,"abstract":"Lime application is the most appropriate technique to raise soil pH, decrease Al3+ toxicity and increase Ca2+ and Mg2+ contents in acidic tropical and subtropical moist soils. The objective of this research is to evaluate changes in chemical attributes and soybean yield in sandy soil after lime incorporation. The soil was classified as a typical Quartzipsamments cultivated with (Brachiaria decumbens Stapf) pasture, and its degradation state was classified as strong. The experimental design was a randomized block with six replicates and four lime doses (0, 2, 4 and 8 Mg ha-1). The soil in the area was prepared with one plowing and two harrowings, followed by lime application and two more harrowings to incorporate the lime up to 0.2 m depth. The dependent variables analyzed were soybean yield; numbers of pods filled, pods not filled, and total pods and soil pH in water, CaCl2 and KCl. All parameters were measured at depth of 0.0-0.1, 0.1-0.2 and 0.2-0.3 m. The increase of soil pH by the different lime rates were observed just in 0.0-0.1 and 0.1-0.2 m layers. After 6 months no changes in soil pH were observed in subsoil (0.2-0.3 m). With lower H+ and Al3+ activity and higher basic cation availability, soybean yield was also changed. The maximum soybean yield of 2,929 kg ha-1 was observed with 4.6 Mg ha-1 lime application, although pod number per plant remained constant, independent of limestone dose.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132288117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6