共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
棉田滴灌技术如今在新疆生产建设兵团得到越来越广泛的应用,由于棉田滴灌管的存在,传统棉田揭膜时间与滴灌使用技术之间形成了矛盾。为解决这一矛盾,寻找出产量最高、品质最优和残膜揭净率最高的揭膜时间和揭膜方式,我们进行了滴灌棉田不同揭膜时间对棉花生育进程、产量和品质的影响的试验和探讨。 相似文献
3.
1.盖膜技巧水稻旱育秧,如果播种较早,春季温度变化较大,最好采用双膜覆盖。即在水稻播种、盖土后,先平贴厢面盖1层地膜,再在厢面上插竹弓,然后盖1层稍厚的农膜。应注意内膜边不必压得过紧,但外层农膜膜边必须封严扎实,以利保温保湿。待谷种出苗后,即可将内层地膜抽出。 相似文献
4.
5.
6.
7.
8.
地膜污染已成为新疆土壤的重要污染物,严重影响现在及未来农业生产发展,即将成为制约新疆农作物产量的主要因素。本试验选择不同品种的生物降解膜进行对比,了解和掌握产品在本地的应用效果,筛选出适合当地推广应用的生物降解膜品种。 相似文献
9.
10.
11.
在2014年去新疆执行农业部棉花纤维品质抽检项目的过程中,通过现场抽样和种子站、团场、种子公司负责人的介绍和情况汇报,比较全面地考察和了解到新疆兵团在棉花区划种植方面的推进措施:在保证棉花生产多样化的前提下,以师为推进集体,通过科学的田间评比试验选择各棉区表现最优异的棉花品种,利用其生产集约化,管理垂直化优势,2011年开始推行"一师一品"或"一团一品"的分区种植模式,各团场品种选择按照品质优先原则进行单一品种种植、全程统一质量管控取得了良好效果,走在了我国实现棉花区化种植管理的前列。 相似文献
12.
"十三五"计划中,中央明确提出种植业结构调整规划,适当调减非优势区玉米种植面积,山西部分地区也在此列,通过分析山西省玉米种植及玉米种业的优缺点,提出了新形势下山西玉米种植及种业的对策和建议。 相似文献
13.
14.
15.
16.
17.
《Agriculture and Environment》1981,5(4):309-320
The application of known technology to the agriculture of the OECD countries could produce far more food than their own populations need. Yet in transferring the surplus food to the food-deficient developing countries there could be problems in the logistics and energy costs of transport and distribution, in interference in conventional marketing arrangements, and in reducing the incentive to produce food in the needy countries. Thus a number of OECD countries are now examining whether they should restrict their levels of food production; certainly there could be less emphasis than in the past on food output per se. This could coincide with a number of unrelated developments which are likely to place restraints upon the level of food production. These include energy problems (food production at the margin is costly in energy), environmental pollution, food quality (including interest in systems of alternative agriculture), food and nutrition policy, and concern for animal welfare. As long as food supply appeared limiting, society was prepared to place only limited restraints on agricultural production systems; this attitude could change if food supplies move towards increasing surpluses. The paper considers the possible implications of such a change for the planning of R and D programmes in agriculture and food, and also for the production decisions taken on individual farms where food is produced. It concludes that, while the effect will differ between countries, depending on levels of self-sufficiency in food, in general increasing are likely to be placed on “output” as a primary objective of agricultural production systems. 相似文献
18.
19.
20.
运用ARCH族模型对中国农资价格波动特征进行分析。主要研究结果包括:农资价格波动存在明显的聚集性和长期记忆性;农资市场不存在所谓的高风险高回报和非对称效应。据此建议:加强政府对农资价格的宏观调控,完善农资市场体系建设和深化农资储备制度。 相似文献