轮作

This experiment researched spring wheat mutiple Melilotus suaveolens is a relatively good crop rotation.

四个处理中春小麦复播草木樨是相对较好的一组轮作作物。

In this paper,five factors causing waterlogging in the lowland polder area s of southern china are listed and reviewed based on the field ecosystem of waterlogging:climate,topgraphy and morphography,soil,hydrology and geology and human activities.

从农田渍害生态系统的角度综述了我国南方低洼圩区产生渍害的五大成因：气候因素、地形地貌因素、土壤因素、水文地质因素和人为因素；在分析南方各地治理渍害经验的基础上，概述了目前改造和防治渍害低产田的七大措施：搞好水利工程建设，实行水旱轮作，加强耕作管理，增施有机肥料，利用抗湿种质资源，喷施外源生长调节剂及应用高分子技术。

2Soil column leachate experiment shows, soil texture and soil section form are the main factors affecting the nitrate leaching; in soil organic fertilizer produce a nitrate leaching process, during five-month experiment, nitrate content has be increasing in leakage solution, organic fertilizer applying decrease the pH and increase the electric conduction of leakage solution, there is positive action between nitrate content in leakage solution and electric conduction, which shows that nitrate-N accumulation during organic fertilizer applying is one of the main factors for soil salification; for decrease the leaching of the nitrate-N in soil, in sandy moisture soil the best amount of organic fertilizer should be 7.5～ 15 t·hm~(-2), in Loamy moisture

在小麦-玉米轮作体系上投入化肥氮300kg·hm~(-2)N和有机肥22.3t·hm~(-2)折N261.2kg·hm~(-2，能使农田氮素收支达到平衡，在兼顾环境效益的基础上获得了较高的产量效益。并通过肥料效应函数和硝态氮累积效应函数进一步预测最佳施肥组合，即化肥氮施用量为N226.5kg·hm~(-2)，有机肥用量为39.9t·hm~(-2)折N466.8kg·hm~(-2，其中小麦季施化肥氮105.85kg·hm~(-2)N、有机肥30t·hm~(-2)折N351kg·hm~(-2，玉米季施化肥氮120kg·hm~(-2)N，有机肥9.9t·hm~(-2)折N115.8kg·hm~(-2。同时，磷素平衡分析表明，在施用有机肥的基础之上，化学磷肥的施用量应适量的减少或不施。

The necessity of these environmental problems calls for the utmost prudence to treat agricultural intensification. Based on detailed expatiation of intensive agriculture, this case study was carried out in the town of Shipan of Jianyang Municipality where a demonstration of rotation of edible mushroom Stropharia rugoso-annulata and rice.

本文对集约化农业作了详细的阐述，在此基础上，以简阳石盘镇水稻和大球盖菇轮作方式为例，该地作为降解作物秸秆的大球盖菇的试种点，改变了以往种植常规作物的农业方式，使大量作物秸秆还田用于生产食用菌大球盖菇。

Therefore, doing research of the nutrient balance in the loessplateau has its practical signification. Using the long-term rotation and fertilization experiment that disposed in dry land on theloess plateau, the paper has studied nutrients in rainfall import to farmland ecosystem andAmmonia volatilization losses and nutrients disbursal of crop, also estimated the balance ofnutrients in farmland soil.

本文利用设在黄土高原旱地上的长期轮作与施肥试验，主要研究了黄土高原农田生态系统养分的降水带入、作物地上部分的氨挥发损失和作物的养分支出，并进行了 N、P、K 养分平衡评价。

The government is helping farmers change their traditional cultivation habits of letting land lie idle after harvest — a centuries-old practice known as "white fallow," which is detrimental to water and soil conservation.

政府帮助农民改变千百年来传统的撂荒式的&白色休耕&等不利于保持水土的耕种习惯，实行粮草轮作等生物手段，提高土壤的肥力和水分涵养能力。

The area of our cropland will decrease,and will harm the food security;The needed quantity of farming land by the year of 2020 is discussed in the article under the four fallow patterns :the seriously polluted faming land;the farming land with low output;the farming land of soil erosion and follow by crop rotation.

休耕会使耕地面积减少，对我国的粮食安全造成不利影响；文中阐述了在污染严重的耕地休耕、中低产田休耕、水土流失严重的耕地休耕以及采用轮作休耕4种不同模式下到2020年我国所需要的耕地保有量。

This involves crop rotation and the rearing of"free-range"livestock which are not force-fed hormones or antibiotics.

这包括到轮作与养育&自由牧场&的牲畜，它们都没有被迫食用激素或抗生素。

Therefore, the key planting techniques for high quality and output of rape are adopting correct intercropping and rotating of crops.

因此，合理搭配油菜作物的间、套、轮作是其夺取优质、高产栽培的关键技术。

All the results suggested that catching crop and rotation has definite restoration effects on the soil quality under continuously cropping of cucumber, anti the effects of planting crown daisy anti garlic were more significant.

说明填闲和轮作制度对黄瓜连作土壤质量有一定的修复效果，尤以填闲茼蒿和青蒜效果明显。

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。