Study on Site-specific Nutrient Management in Cotton Field     

YANG Li-ping  Jiang Cheng  JIN Ji-yun  ZHANG Feng-ming 《中国农业科学(英文版)》2001,(1):102-106

The study on the characteristics of spatial variability of soil nutrients and fertilizer recommendations in cotton field under certain conditions of agricultural management was conducted with GIS and systematic approach for soil nutrient constrains. The results showed that of the spatial variability of soil nutrient was greatly related to the management condition of previous crops. Grid sampling and variable rate application technology (VRAT) were the tools that would hopefully increase fertilizer efficiency. The fertilizers were applied where they were needed and at proper rate. Balance fertilization demonstration showed that fertilizer recommendations according to the available nutrient level in soil could decrease fertilizer cost with 657.4 yuan / ha and increase seed cotton yield by 19.8%. A net profit of the balanced fertilization was 5314.9 yuan / ha higher than that of local fertilization practice.  相似文献   

莫能菌素浓度对混合瘤胃微生物体外发酵的影响   总被引：10，自引：1，他引：9  

王中华  林雪彦  李富昌  谢幼梅  万仁忠  高秀华 《动物营养学报》2002,14(4):59-62

本试验研究了莫能菌素对混合瘤胃微生物体外发酵的影响 ,以期确定莫能菌素在瘤胃内容物中的适宜添加浓度。混合瘤胃微生物由饲喂花生秧基础日粮的阉公牛瘤胃内容物和瘤胃液制备 ,用简易人工瘤胃装置测定莫能菌素浓度对产气量、瘤胃乙丙酸比例、粗纤维降解率和真蛋白产量的影响。结果表明 ,莫能菌素浓度强烈地抑制产气量 ,两者呈线性负相关(P<0.05);粗纤维降解率开始时随莫能菌素浓度的升高而增加 ,在浓度为0.078mg/L时达到最大值 ,两者呈二次幂函数关系 ;添加莫能菌素降低了瘤胃乙丙酸比例 ,但瘤胃乙丙酸比例随莫能菌素浓度的提高有逐渐增加的趋势 ;在莫能菌素浓度为0.1～2.0mg/L的范围内 ,添加莫能菌素对蛋白质的产量没有明显影响  相似文献   

南美白对虾淡水养殖试验报告   总被引：3，自引：0，他引：3  

陈德福  孟凡峰等 《齐鲁渔业》2002,19(4):15-16

采取人工调兑淡水盐度，定点投喂颗粒饲料，调节水质及病害预防措施，在667m^2淡水池塘中养殖南美白对虾，经107天的饲养管理，共产南美白对虾160．2kg，平均体长达13．5cm/尾，体重20g/尾，成活率达到80．1％，共获利润5732．5元，投入产出比1：2．47。  相似文献   

23种广东常见阔叶树材的耐磨性质     

胡慕任  刘淑兰 《木材工业》1992,6(3):37-43

本文报导23种广东常见阔叶树材的耐磨性试验结果,并对耐磨性与木材密度、硬度的关系及木材耐磨性各向异性问题作了讨论。  相似文献   

The Effect of Detopping the Field Bean Plants (Vicia faba L. minor) and Lack of the Pod Setting on the Symbiosis with Root Nodule Bacteria     

W. Filek    F. Dubert  M. Kaminski 《Journal of Agronomy and Crop Science》1996,176(1):39-45

The plants of field bean var. Nadwiślaνski were detopped after about 1 month since the beginning of flowering and after that all flower buds were removed from some plants. The effect of a change in the trophic balance on the setting and subsequent growth of root nodules was studied.
The removal of pods had the greater effect on the increase in the weight of the remaining organs than the detopping of plants. Detopping retarded the ageing of the plants and delayed the phase of the greatest reduction of the number of pods. The detopping of plants revealed their considerable compensative possibilities in terms of production of the pod weight and the potential of leaves for biomass production. The data obtained indicate that plant detopping may disturb the root–bacteria exchange of signals, necessary to initiate the nodule development, while the further growth of nodules depends, above all, on the amount of available photosynthates.
A very high correlation between the dry weight of the whole plant to the dry weight of leaves ratio and the weight of nodules was observed. It proves the importance of the trophic balance of the plant for the root nodule weight production.  相似文献   

乙草胺防除辣椒田杂草的药效试验   总被引：1，自引：0，他引：1  

李茹  赵桂东  周玉梅 《安徽农业科学》2001,29(5):628-628

50 %乙草胺EC 12 0 0、15 0 0ml/hm2 在辣椒苗移栽前 1d对土壤用药 ,对辣椒安全 ,除草效果在 75 .0 %～ 82 .6 %之间 ;乙草胺对禾本科杂草的防效好于阔叶草  相似文献   

瞿麦治疗仔猪黄白痢的效果比较   总被引：4，自引：0，他引：4  

陈孟军 《四川畜牧兽医》2002,29(Z1):29-29

通过用瞿麦单味中药与庆大、链霉素抗生素治疗仔猪黄白痢的效果比较,表明中药瞿麦的治疗效果较好,治愈率达95%以上,明显高于庆大霉素、链霉素等西药的疗效(P＜0.01),是临床治疗黄白痢较理想的中药药剂.  相似文献   

河北坝上农田垄向对土壤风蚀的影响   总被引：3，自引：0，他引：3  

荣姣凤  高焕文  王晓燕 《中国农业大学学报》2004,9(3):13-15

在河北省坝上选择试验区 ,利用移动式风洞研究了农田起垄方向对土壤风蚀的影响。结果表明 ,农田起垄方向对土壤风蚀具有影响作用 :垄向与风向成 0°时风蚀量最大 ,90°时风蚀量最小 ;在 15m·s-1风速和 3cm表土含水率为 4 5 %的条件下 ,垄向与风向成 0°时的风蚀量为 90°时的 4 8倍。为减轻土壤风蚀危害 ,在河北坝上地区农田起垄的方向宜采用与自然风向NW (西北风向 ,315°)成 90°,即东北方向 4 5°。  相似文献   

一种适合稻区紫云英生产实际的紫云英加工调制方式   总被引：1，自引：0，他引：1  

闫景彩  屠敏仪  王继成 《草业科学》2001,18(1):78-80,F003

将紫云英鲜草分离为草汁、细渣、纤维状渣；以粉状能量精料为载体吸收汁液；3种制品都以晾晒的方式进行干燥。晾晒时，3种制品综合占场面积较原草减少近90％；3种制品均可在一个晴日内风干，比原草干燥速度提高一倍余；细渣品质与国标一级苜蓿草粉相当；“二次拌汁料”、“三次拌汁料”之粗蛋白、粗纤维含量符合生长肥育猪饲养标准；加工方式切合稻区紫云英生产实际及产区综合条件，有推广价值，且易推广。  相似文献   

潜江小城镇景观规划     

彭凤 《湖北农学院学报》2001,21(2):188-191

潜江小城镇的水资源丰富但开发落后，绿系统不完善，街景缺乏工艺性。在对现状调查分析的基础上，提出了对过境公路、水体、街景进行动感空间、情感空间规划的建议，对乡土化设计、恢复性设计进行了探讨。  相似文献