Netherlands Journal of Agricultural Science最新文献_第7页

Relation between stolon and tuber characteristics and the duration of tuber dormancy in potato 马铃薯匍匐茎与块茎性状及块茎休眠期的关系

Netherlands Journal of Agricultural Science Pub Date : 1992-06-01 DOI: 10.18174/njas.v40i2.16522

M. Ittersum, P. Struik

引用次数: 22

Ultrastructural investigations of enzyme treated cell wall material from industrial by-products. 酶处理工业副产物细胞壁材料的超微结构研究。

Netherlands Journal of Agricultural Science Pub Date : 1992-06-01 DOI: 10.18174/NJAS.V40I2.16520

F. M. Engels, N. Schalk

引用次数: 1

Effects of spatial variability of nitrogen supply on environmentally acceptable nitrogen application rates to arable crops. 氮素供应空间变异对环境可接受氮素施用量的影响

Netherlands Journal of Agricultural Science Pub Date : 1992-03-01 DOI: 10.18174/njas.v40i1.16529

M. Noordwijk, W. Wadman

引用次数: 19

An automated method for measuring time-course of gas production of feedstuffs incubated with buffered rumen fluid 一种测量饲料与缓冲瘤胃液孵育产气时间过程的自动化方法

Netherlands Journal of Agricultural Science Pub Date : 1992-01-23 DOI: 10.18174/njas.v40i4.16501

J. Beuvink, S. Spoelstra, R. J. Hogendorp

引用次数: 70

Nutritional characteristics of cattle forage plants in the eutrophic nature reserve Oostvaardersplassen, Netherlands. 荷兰Oostvaardersplassen富营养化自然保护区牛饲料植物的营养特性。

Netherlands Journal of Agricultural Science Pub Date : 1991-12-01 DOI: 10.18174/njas.v39i4.16536

J. T. Vulink, H. Drost

{"title":"Nutritional characteristics of cattle forage plants in the eutrophic nature reserve Oostvaardersplassen, Netherlands.","authors":"J. T. Vulink, H. Drost","doi":"10.18174/njas.v39i4.16536","DOIUrl":"https://doi.org/10.18174/njas.v39i4.16536","url":null,"abstract":"The nutritional value of the main cattle forage plants was studied in the terrestrial part of the eutrophic wetland the Oostvaardersplassen, the Netherlands. The digestible organic matter (DOM) content and the chemical composition of the forage classes grasses, reed, forbs and browse varied seasonally. The DOM content of all forage classes showed a decrease from spring to winter as usual. However, the assumed minimum energy content for cattle mainte nance (approximately 450 g DOM kg -1 dry matter) was reached at different moments in the different forage classes. Reed reached it in autumn, grasses in winter, forbs (living parts) re mained the entire year above this level and browse remained the entire year below this level. Grazing delayed the maturation of Poa trivialis, reed ( Phragmites australis) and the impor tant forb Urtica dioica. The protein, K, Ca, P, Cu content of the four forage classes exceeded the cattle maintenance levels for these nutrients the whole year. The Na and Mg content of grasses, reed and browse were marginal in some periods of the year. Due to their high miner al contents, the forbs were an important mineral source in cattle diets. When compared with literature data from oligotrophic and mesotrophic habitats, the studied Poa-Phragmites eu trophic habitat offers comparable feed quality in spring, summer and autumn, but is inferior in winter.","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126897941","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: 11

Effects of changing land use in the Netherlands on net carbon fixation 荷兰土地利用变化对净固碳的影响

Netherlands Journal of Agricultural Science Pub Date : 1991-12-01 DOI: 10.18174/njas.v39i4.16534

J. Wolf, Larry Janssen

{"title":"Effects of changing land use in the Netherlands on net carbon fixation","authors":"J. Wolf, Larry Janssen","doi":"10.18174/njas.v39i4.16534","DOIUrl":"https://doi.org/10.18174/njas.v39i4.16534","url":null,"abstract":"For three land use systems, arable land, grassland and forest, average carbon flows and car bon pools in the Netherlands have been determined. For harvested products data are avail able from statistics and they were used as a basis for calculating the carbon flows. Average carbon pools, particularly in the soil, cannot be derived directly. For the calculation of this carbon pool a method has been applied that requires only three input data: the average amount of crop or tree residues, the decomposition rate of soil organic matter and the so called humification coefficient. For broad studies this simple method can particularly be use ful. However, this method can only be applied to situations in equilibrium, where the rates of incorporation of crop residues or tree litter and decomposition of soil organic matter are just equal and hence, the soil carbon is constant. In the soil, a state of equilibrium may not really occur, as continually changes in crop rotation and land use will take place. For a changing land use and hence a changing rate of incorporation of organic material it is shown how the new state of equilibrium and the rate of change in carbon pool size can be calculated. For a number of actual changes in land use in the Netherlands the resulting changes in carbon pool sizes were determined.","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124929170","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: 19

Re-thinking erosion on Java. 重新思考对Java的侵蚀。

Netherlands Journal of Agricultural Science Pub Date : 1991-12-01 DOI: 10.18174/NJAS.V39I4.16532

W. Diemont, C. Mannaerts, Nurdin, Nurdin, A. C. Smiet, T. Rijnberg

引用次数: 21

Uptake of nutrients by lettuce on NFT with controlled composition of the nutrient solution. 控制营养液组成的NFT上生菜对养分的吸收。

Netherlands Journal of Agricultural Science Pub Date : 1991-09-01 DOI: 10.18174/njas.v39i3.16542

M. Heinen, A. Jager, H. Niers

{"title":"Uptake of nutrients by lettuce on NFT with controlled composition of the nutrient solution.","authors":"M. Heinen, A. Jager, H. Niers","doi":"10.18174/njas.v39i3.16542","DOIUrl":"https://doi.org/10.18174/njas.v39i3.16542","url":null,"abstract":"An automatically-controlled recirculating NFT system was developed, consisting of a growth unit and a measuring and control unit. It is described together with some basic growth and uptake models. Results are presented of a preliminary experiment with the lettuce cultivar Sitonia (using manual control and nutrient dosage). The % DM in the heads decreased from 6.86 (week 1, 20 June 1988) to 3.89 (week 5, 25 July). The shoot:root ratio increased from 0.50 (week 1) to 6.47 (week 6). The time courses of DW increase and cumulative uptake of macronutrients were well described by exponential equations. The cumulative uptake determined from the loss of nutrients from the nutrient solution exceeded that determined from plant analysis. Cumulative uptake as a function of cumulative daily radiation was well described by a logistic equation. Some constant plant uptake ratios between micro- and macronutrients were observed: Cl uptake was related to that of N, K, P or Mg, and B uptake to that of K. DW as a function of transpiration was also well described by a logistic model, with an average DM production of 3.1 g/litre transpired; a logistic model also expressed transpiration as a function of radiation, with an average transpiration output of 5.8 litres/unit (kJ/cmsuperscript 2) increase in radiation. (Abstract retrieved from CAB Abstracts by CABI’s permission)","PeriodicalId":324908,"journal":{"name":"Netherlands Journal of Agricultural Science","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133514877","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

Transformation rate of methyl isothiocyanate and 1,3-dichloropropene in water-saturated sandy subsoils. 异硫氰酸甲酯和1,3-二氯丙烯在水饱和砂质底土中的转化率。

Netherlands Journal of Agricultural Science Pub Date : 1991-09-01 DOI: 10.18174/NJAS.V39I3.16540

J. Boesten, L. J. T. Pas, J. Smelt, M. Leistra

引用次数: 31

Growth analyses of tomato genotypes grown under low energy conditions. 低能条件下番茄基因型的生长分析。

Netherlands Journal of Agricultural Science Pub Date : 1991-09-01 DOI: 10.18174/njas.v39i3.16541

M. Nieuwhof, F. Garretsen, J. C. Oeveren

引用次数: 9