Netherlands Journal of Agricultural Science最新文献_第10页

The Institute For Soil Fertility Research 1890 - 1990 土壤肥力研究所(1890 - 1990)

Netherlands Journal of Agricultural Science Pub Date : 1990-09-01 DOI: 10.18174/NJAS.V38I3A.16584

K. Harmsen

引用次数: 6

Determination of mass balances and ionic balances in animal manure 动物粪便中质量平衡和离子平衡的测定

Netherlands Journal of Agricultural Science Pub Date : 1990-09-01 DOI: 10.18174/njas.v38i3a.16593

J. Japenga, K. Harmsen

引用次数: 61

Nitrogen cycling in high-input versus reduced-input arable farming 高投入与低投入耕作的氮循环

Netherlands Journal of Agricultural Science Pub Date : 1990-09-01 DOI: 10.18174/njas.v38i3a.16588

H. V. Faassen, G. Lebbink

引用次数: 28

Feeding strategy during pregnancy for ewes with a large litter size. 2. Effect on blood parameters and energy status. 大产仔母羊怀孕期间的喂养策略。2. 对血液参数和能量状态的影响。

Netherlands Journal of Agricultural Science Pub Date : 1990-09-01 DOI: 10.18174/NJAS.V38I3B.16577

H. Everts

{"title":"Feeding strategy during pregnancy for ewes with a large litter size. 2. Effect on blood parameters and energy status.","authors":"H. Everts","doi":"10.18174/NJAS.V38I3B.16577","DOIUrl":"https://doi.org/10.18174/NJAS.V38I3B.16577","url":null,"abstract":"In 6 feeding trials with pregnant ewes, blood glucose concentrations were affected by litter size after day 84 of pregnancy. An increase in litter size decreased blood glucose during the last phase of pregnancy. At day 141 a sharp increase in glucose was seen. Ewes with ketosis had after day 126 of pregnancy a significant lower glucose concentration. beta -Hydroxybutyrate (BHB) and non-esterified fatty acids (NEFA) were also affected by litter size in the last months of pregnancy. With increasing litter size BHB increased more dramatically than NEFA concentrations. Ewes with ketosis had higher BHB and NEFA concentrations in the last month of pregnancy. Ewes on treatments with a higher metabolizable energy (ME) intake (rations with 60% of the energy originating from concentrates) had a higher glucose, a lower BHB and a lower NEFA concentration in the last month of pregnancy than ewes given a diet with 40% of the energy originating from concentrates. A lower incidence of ketosis on treatments with a higher energy intake was expected, but not seen. Probably, energy deficit is not the only factor inducing ketosis. With regression models the energy requirement of pregnant ewes with a body weight of about 85 kg during the last month of pregnancy was estimated. ME requirement in MJ per day for a ewe with a single, twin, triplet, quadruplet and quintuplet was 13.0, 15.9, 17.1, 18.4 and 19.1, respectively. The estimated energetic efficiency of conceptus growth was about 0.16. (Abstract retrieved from CAB Abstracts by CABI’s permission)","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116623096","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: 17

Ammonia volatilization from arable land after application of cattle slurry. 1. Field estimates 施用牛浆后耕地氨挥发。1. 场估计

Netherlands Journal of Agricultural Science Pub Date : 1990-06-01 DOI: 10.18174/njas.v38i2.16601

J. Molen, H. V. Faassen, M. Leclerc, R. Vriesema, W. Chardon

{"title":"Ammonia volatilization from arable land after application of cattle slurry. 1. Field estimates","authors":"J. Molen, H. V. Faassen, M. Leclerc, R. Vriesema, W. Chardon","doi":"10.18174/njas.v38i2.16601","DOIUrl":"https://doi.org/10.18174/njas.v38i2.16601","url":null,"abstract":"Cattle slurry was surface-applied to bare soil in two experiments in September-November 1987, while in April-May 1988 two experiments were carried out in which the slurry was mixed with the upper 6 cm of the soil with a cultivator immediately after spreading. The 1987 experiments both lasted 18 days, the 1988 experiments 9 days. A micrometeorological technique, which did not disturb the dynamics of the air flow, was used to measure NH3 volatilization. Volatilization losses were also determined indirectly from mineral-N contents of soil-slurry samples collected at intervals after application. Diurnal fluctuations in the NH3 flux occurred throughout the experimental period, with maxima around midday and minima at midnight. The magnitude of the daily flux values decreased with time. The amounts of N lost through volatilization from surface-applied cattle slurry were 18 and 33% of the total N, resp., during the first 9 days, corresponding to 32 and 67% of the ammoniacal N applied with the slurry. Volatilization was negligible after day 9. Incorporation of the slurry into the soil considerably decreased the loss of N through volatilization: volatile losses of N after 9 days amounted to 6 and 7% of the total N, which corresponds to 11 and 16% of the ammoniacal N applied with the slurry. (Abstract retrieved from CAB Abstracts by CABI’s permission)","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115093979","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: 56

Detection, causes and consequences of convection currents in bulk stored grain. A synopsis. 散装储粮中对流的检测、原因和后果。剧情简介。

Netherlands Journal of Agricultural Science Pub Date : 1990-06-01 DOI: 10.18174/NJAS.V38I2.16604

C. Uiso, M. C. Gough, C. Stigter

引用次数: 1

Simulation of dry matter production and distribution in cassava (Manihot esculenta Crantz). 木薯(Manihot esculenta Crantz)干物质生产与分配模拟。

Netherlands Journal of Agricultural Science Pub Date : 1990-06-01 DOI: 10.18174/njas.v38i2.16602

H. Gijzen, H. Veltkamp, J. Goudriaan, G. D. Bruijn

引用次数: 16

Effect of pattern of water supply on Vicia faba L. 2. Pod retention and filling, and dry matter partitioning, production and water use. 供水方式对蚕豆生长的影响。荚果保持和灌浆、干物质分配、生产和水分利用。

Netherlands Journal of Agricultural Science Pub Date : 1990-06-01 DOI: 10.18174/NJAS.V38I2.16600

C. Grashoff

{"title":"Effect of pattern of water supply on Vicia faba L. 2. Pod retention and filling, and dry matter partitioning, production and water use.","authors":"C. Grashoff","doi":"10.18174/NJAS.V38I2.16600","DOIUrl":"https://doi.org/10.18174/NJAS.V38I2.16600","url":null,"abstract":"Pod retention and pod filling of faba beans were studied under different patterns of water supply. Mild water shortage during flowering, followed by plenty of water after flowering (d-i), resulted in high seed yields at lower stem nodes (defined as the first podding node to node number 11) in cv. Alfred. The inverse treatment (i-d: plenty of water during flowering, followed by increasing water shortage after flowering), but also i-i (plenty of water during and after flowering), showed 20-60 % lower seed yields at those nodes. This effect was main ly due to a lower number of pods per node. In i-i, but not in i-d, the low pod retention at lower nodes was compensated at higher nodes (defined as node 12 to the last podding node). These results help to explain the mechanism of the interaction between water supply pattern and the development of reproductive sinks. The quantitative consequences of these effects on the relation between total water use and seed yield are discussed. Without taking into ac count different water supply patterns, a linear relation between total water use (represented by total dry matter production) and seed yield explains already 75-85 % of the variation in seed yield. If different water supply patterns are included in the regression analysis, more than 90 °!o of the variation in seed yield can be explained. The i-i patterns, compared to d-i, result in sub-optimum dry matter partitioning to reproductive organs, but show a smaller seed yield variability. This indicates that defining and maintaining the optimum level of (mild) water shortage under varying climatological conditions needs further attention.","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123732749","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: 27

Shrinkage of Dutch clay soil aggregates. 荷兰粘土团聚体的收缩。

Netherlands Journal of Agricultural Science Pub Date : 1990-06-01 DOI: 10.18174/NJAS.V38I2.16603

J. Bronswijk, J. J. Evers-Vermeer

引用次数: 84

Crop photosynthesis, respiration and dry matter production of maize. 玉米作物光合作用、呼吸作用和干物质生产。

Netherlands Journal of Agricultural Science Pub Date : 1990-06-01 DOI: 10.18174/NJAS.V38I2.16597

W. Louwerse, L. Sibma, J. V. Kleef

{"title":"Crop photosynthesis, respiration and dry matter production of maize.","authors":"W. Louwerse, L. Sibma, J. V. Kleef","doi":"10.18174/NJAS.V38I2.16597","DOIUrl":"https://doi.org/10.18174/NJAS.V38I2.16597","url":null,"abstract":"Above-ground net photosynthesis and respiration of a maize crop (Zea mays L.) was deter mined in the field during the growing season (mid June-end of October) at regular intervals (1 à 2 weeks) at two temperatures (12.5 and 22.5 °C) by measuring the C02 uptake or release in mobile crop enclosures. The actual growth rate of the crop was determined from fortnightly harvests. Temperature dependence of photosynthesis was highest in the early (till mid July) and very late (begin October) stages of crop growth, showing a reduction of about 50 % at the higher irradiances (> 400 W m~2). In the period of major dry matter produc tion (mid July-September) the reduction was only 12-15 %. Assuming maintenance respira tion to become constant for cobs and grain exceeding a yield of 1000 kg ha 1 and for stems exceeding 2500 kg ha1, the measured and calculated dark respiration at 22.5 °C matched fairly well. At 12.5 °C the calculation, using the same assumtions, overestimated significantly dark respiration during the first part of the growing period. The carbon balance sheet showed t h a t f r o m t h e t o t a l a m o u n t o f C 0 2 a b s o r b e d b y t h e c r o p ( e q u i v a l e n t t o 3 0 . 7 t D M h a 1 ) , 30 <% was lost by above-ground respiration and 50 % was invested in above-ground harvestable material. The remaining 20 % is assumed to be transported to plant parts under the ground. Substantial losses of dry matter at the end of the growing season did not occur.","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128155104","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: 14