Effects of Two Underseed Species, Medicago polymorpha L. and Scorpiurus muricatus L., on the Yield of Main Crop (Durum Wheat) and Subsequent Crop (Teff) Under Humid Moisture Regimes in Ethiopia     

L. Pülschen 《Journal of Agronomy and Crop Science》1992,168(4):249-254

Mixed cropping of leguminous underseed species and cereal crops may increase productivity and serve some additional purposes. Two leguminous weed species which are widely distributed in annual crops of the Ethiopian highlands have been studied with varying coverage in greenhouse trials in Ethiopia with regard to their suitability as underseeds and with wheat ( Triticum turgidum [L.] Thell. var. durum [Desf.] MacKey) as a main crop. The competitive effects of Scorpiurus muricatus L. on the grain yield of wheat were smaller than those of Medicago polymorpha L. (-14.1 % and -23.6 % respectively, compared with the underseed free control) which is mainly ascribed to differences in their speed of development and shoot height. The residual effects of the underseed's root masses on the grain yield of the successive teff crop (Eragrostis tef [Zucc] Trotter) were significantly higher with Scorpiurus muricatus (+99.3 %) than with Medicago polymorpha (+63.6 %). The results are discussed with regard to the specific site conditions in the cereal-dominated cropping systems of the Ethiopian highlands.  相似文献   

研究森林变化对河川水沙影响的一种便捷方法──以四川省都江堰市白沙河为例     

杨雨行 《北京林业大学学报》1995,(1)

依据航片判读、森林资源调查资料和水文数据，利用流域自身对比法，得出森林变化对河川径流泥沙的定量关系。文中还阐明本方法的技术关键——消除降雨量不同对水沙的影响．该方法具有适合我国国情、费小效宏、精度较高、简捷易行等优点，值得推广提倡。  相似文献   

夏大豆亩产262.1kg生理指标研究   总被引：4，自引：1，他引：3  

卢增辉  赵俊杰 《大豆科学》1994,13(3):185-192

研究了夏大豆中油－８９Ｄ亩产２６２．１ｋｇ各项生理指标：叶面积系数，开花期、结荚期、鼓粒期分别为３．９８、５．８０、４．９１；总光合势１８．２万ｍ＾２·日，平均净光合生产率４．８１ｇ／ｍ＾２·日，氮磷总积累量分别为２２．２８ｋｇ和３．１３ｋｇ，每生产１００ｋｇ籽粒需吸收氮８．５０ｋｇ，磷１．１９ｋｇ，总干物质积累８７６．４７ｋｇ，粒茎比０．５１，经济系数０．３０。  相似文献   

Mesangioproliferative Glomerulonephritis in Mink with Encephalitozoonosis     

Z.-Y. Zhou  K. Nordstoga 《Acta veterinaria Scandinavica》1993,34(1):69

Renal specimens from 6 mink with encephalitozoonosis were studied by light and electron microscopy and immunohistochemistry. The glomeruli of affected kidneys had a mesangioproliferative glomerulonephritis which was characterized by an increase in mesangial cells and matrix in most glomeruli. Some glomeruli were partially or completely sclerosed. There were protein or granular casts in the cortical and medullary tubules. Interstitial nephritis, vasculitis and tubular cysts were found. Electron microscopy demonstrated extensive matrix and increased cellularity in the mesangial areas. Glomeruli showed segmentally thickened or wrinkled capillary basement membranes. Electron dense deposits were found in the glomerular basement membranes and mesangium. Peroxidase-anti-peroxidase immunohistochemistry demonstrated that IgG and IgM positive material was present as granular deposits in the glomerular basement membrane and occasionally in the mesangium.  相似文献   

Analysis of Growth and Productivity of Indian Mustard (Brassica juncea) in Relation to FYM, Nitrogen and Source of Fertilizer     

R. H. Patel  T. G. Meisheri  J. R. Patel 《Journal of Agronomy and Crop Science》1996,177(1):1-8

A field experiment was conducted during the winter seasons of 1992–93 and 1993–94 at Anand to study the effect of FYM, nitrogen and source of fertilizer on growth and yield of mustard [ Brassica juncea (L.) Czernj & Cosson]. The results showed significant variation in leaf area index (LAI), crop growth rate (CGR), dry matter production and seed yield. The direct effect of farmyard manure (FYM) was conspicuous in improving the growth of mustard. FYM application at 10 tonnes ha⁻¹ significantly increased the LAI, CGR and dry matter accumulation per plant at almost all the stages during first year study (1992–93) and in pooled analysis. Similarly, nitrogen application registered maximum LAI, CGR at 75 kg level and RGR and NAR at 50 kg level at almost all the during both years. Sulphur carrying source (Ammonium sulphate plus single super phosphate) increased all stages growth characters. Maximum dry matter accumulation per plant and seed yield were recorded with highest levels of FYM (20 tonnes ha⁻¹), N (75 kg ha⁻¹) and source having S. Seed yield was strongly associated with LAI and dry matter accumulation per plant at all the stages.  相似文献   

学会改革与发展面临的问题及对策     

安凯春 《勤云标准版测试》2005,(7)

随着社会主义经济体制的逐步完善,改革的不断深化和对外开放的进一步扩大,学会在组织体制、管理模式、运行机制和活动方式等方面,还不能完全适应社会主义市场经济的要求,在综合分析学会存在诸多问题以及面临激烈竞争和严峻挑战的基础上,针对农业学会目前现状,提出了对策,以及今后努力发展的方向。  相似文献   

SH系砧木及对应中间砧红富士苹果枝条水分输导阻力研究   总被引：1，自引：0，他引：1  

史宝胜  徐继忠  陈海江  马宝焜  郭润芳 《河北林果研究》2001,16(2):136-139

为进一步揭示砧木的矮化机理 ,以SH系矮化砧木及相应中间砧红富士苹果为试材 ,在生长季测定砧木枝条及嫁接部位的水分输导阻力。结果表明 ,SH系砧木枝条及嫁接部位的水分输导阻力 ,随砧木矮化程度的升高而增大 ,表明水分输导阻力的增加 ,是导致嫁接树矮化的原因之一。  相似文献   

菌根生物技术应用现状与研究进展   总被引：4，自引：0，他引：4  

蒋家淡  林延生  詹正宜  鲍晓红  刘亨平 《甘肃农业大学学报》2001,36(2):221-225

论述了菌根的类型、功能及其在林业上的应用现状，并指出菌根生物技术研究进展与方向，为林业生产提供参考。  相似文献   

降低人造板热压机液压系统油液污染的探讨     

丁勇义 《林业机械与木工设备》2001,29(7):20-22

车间粉尘与湖湿空气是人造板热压机液压系统油液外界污染的主要原因，通过构筑封闭式泵房，增设辅助油箱，改变没箱底部结构，设置排污，排水装置，可有效降低人造板热压机液压系统油液污染，改善液压系统性能，提高压机工作效率。  相似文献   

毛细管电泳及其在药物分析中的应用     

刘艳华 《中国兽药杂志》2003,37(11):45-47

阐述了不同操作模式毛细管电泳的分离机制，介绍了其在药物分析中的应用。  相似文献