轮作

Planting system of grain oil-bearing and fresh crop, planting index, per unit area yield, gross output, planting way and crop rotation system of the whole Tibet in different period, as well as the planting situations of agricultural districts of river valley such as Lhasa, Lhoka, Shikaze,etc. were analyzed. The main agricultural district of Tibet at present were summarized:(1) Crop composition and distribution is unreasonable;(2) The intensive cropping development is slow;(3) The planting mode is single.

通过分析全区不同时期种植指数，粮、经、饲作物结构，单产，总产，种植方式和轮作体制，以及拉萨、山南、日喀则等河谷农区的种植情况，概括和总结出目前西藏主要农区：(1)作物布局不尽合理；(2)多熟种植制的发展缓慢；(3)种植体制模式单一。

Grassland agriculture is the import part of persistent and ecological agriculture with the most profit of economic and ecology, and it has the broad foreground through the waste reuse, leaf arming and intercrop to established the production system of agriculture in the extraried desert.

通过弃耕地种草、牧草与农作物的轮作倒茬和间作套种技术等，建立集生态效益、经济效益、社会效益三位于一体的草地农业生产，在极干荒漠区具有良好的推广应用前景。

In order to evaluate the restoration effect of cropping systems on continuous cropping soil, treatments of nitrogen-catching crop, rotation, and intercrop were adapted to study soil fertility and microbial indexes of the soil from an 8-year continuous cropping field using pot experiments. Fallow was used as a control. Cucumber yield were recorded.

为了评价栽培制度对连作障碍土壤的修复效果，采用盆栽方式，设置休闲、轮作、间作等处理，以生产中常用的栽培制度即夏季休闲的连作制度为对照，研究各处理对连作8年黄瓜的温室土壤生物修复效果及对后茬黄瓜产量的影响。

A 1-year Lysimeter experiment was conducted to study the effect of different N-release rates of polyolefin-coated urea and common urea at different application rates on development of wheat and maize and N losses in a wheat-maize rotation at Changping, Beijing.

应用渗滤池研究了褐潮土不同用量包膜尿素和普通尿素对小麦－玉米轮作条件下作物生长发育和地下水污染的影响。

It was based on mixed farming and was centered around grazing cattle, leguminous forage and green manure crops, grown in rotation with cereals, root crops and oil seeds.

它是以间作农业为基础，即以放牧为中心，豆科牧草、绿肥作物与禾谷类、块根类及油料作物进行轮作。

For I feel peaceful and comfortable nearside Zhuanjing Lun,without them ,emptiness around me .

没有转经轮我会觉得心空荡荡的，我对转经轮很有信心，只要我有生之年有一口气，我就要弘扬转经轮，只要有客人来，我就赠送转经轮作为礼物，种下善根。

Were higher ,which may be related to the similar cultivating and management of three soil samples .Postgraduate: Jiao Xiaodan Major: Olericulture Supervise: Prof.Wu Fengzhi

长期轮作的15、18及21年土壤间相似程度很高，这可能与这三种土壤的栽培及管理制度也非常相似有关。

Using organic fertilizers to replace 20～30% chemical fertilizers could reduce more than 30% TN loss in rainfall runoff, seeding-period and field-baking-period drainage, and could decrease 19.43～25.91% leaching loss of TN. In wheat field, using organic fertilizers to reduce 20% chemical fertilizers, in which refined organic fertilizers could reduce 2.59kg/ha leaching loss coefficient of TN, zymolytic pig ordure could increase 2.22kg/ha leaching loss coefficient of TN.

水稻田在增施有机肥而减少20～30％化肥用量的情况下，包括降雨径流、播期和烤田排水的TN流失量可以减少30％以上，TN渗漏淋失可以减少19.43～25.91％；麦田在增施有机肥而减少20％化肥用量的情况下，施用精制有机肥可以减少TN淋失2.59kg／ha，施用发酵的猪粪则增加TN淋失2.22kg／ha；蔬菜轮作试验表明，相同施肥量下，适当使用精制有机肥可以减少TN淋失12.80kg／ha。

Ba sed on the regional ecological condition and the resources characteristics, the measures to improve the hilly eco-environment should be multiply arranged by following the strategical rules and the technique requirements which are plantin g grass and trees sparsely, growing the crops and fruit trees in the terrace, ro tationally cutting the grass, using the forest by rationally graziery, and makin g the soil and water conservation industrialization.

山区生态环境建设应从区域生态资源实际出发，按照林草建设疏林化，粮果生产梯田化，刈割草场轮作化，森林利用畜牧化，水土保持产业化的战略原则和技术要求，镶嵌配置。

The nitrogen loss way in winter wheat and summer maize was studied based on field experimental data.

根据田间试验结果对冬小麦/夏玉米轮作体系中氮素的损失途径进行了分析。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。