查询词典 cropping

Inter-, under- and multiple cropping is an effective practice to fully use sunlight, heat and soil resources.

以间、套、复种为主要方式的多熟种植制是充分利用光、热和土地资源的种植方式。1952年我国的复种指数为139.9%。

Like many of the new crops, this system of multiple cropping seems to have reached the Islamic world from India, where it had long been practised.

像许多的新作物一样，这种多熟制好像是从印度传入伊斯兰世界，在印度多熟种植由来已久。

Multiple cropping system is a special characteristic of agriculture in China, which has crucial function on feeding 22% people of the whole word by 10% cultivate field of the whole world.

中国农业能以占世界 10%的耕地养活世界上 22%的人口，多熟种植起着决定性的作用。复种指数作为耕地耕作能力的主要指标以及气候农业生产模型中的必需变量，一直是基于行政单元的统计，存在较多的问题，不易于评价与研究。

During 3 years, six different multiple cropping rotation systems were studied at varying levels of water application in Hexi oasis irrigation area.

在不同供水条件下，对河西绿州灌区6种多熟轮作方式进行了3年3区节水轮作体系的研究。

The yield and the utilization rate of solar energy and heat increased by more than 20%. It showed that this new multiple cropping pattern is an effective way to further increase yield in this region.

该模式实现高产的关键是充分利用间套作复合群体高强度的纳密功能，并形成一个高光效的群体结构，使复合群体的受光改善和截光能力增强。

About the agriculture, besides the study of the growth in population and land, the key study is about grain, the double-harvest rice and the multiple cropping of rice and wheat.

对于农业的研究，除了研究人口增长与土地开发之外，重点研究了粮食亩产量，并以此为中心研究了双季稻以及稻麦复种等问题。

An explicit spatial and temporal analysis of the complex dynamics of multiple cropping in the context of coupled human and natural systems is necessary for modeling and evaluating the impacts of human activity on global environmental change and food security.

在空间和时间上清晰地认识农业多熟种植的特征，将会对掌握高强度土地利用的过程和特点，模拟与评估土地利用对粮食安全及生态环境安全的影响有重要的意义。

Other factors that were found to have positive effects on soil nutrientsinclude the multiple cropping index and the practice of plowing stalks back into theland.

相对于土地调整形成的地权不稳定，土地交易权不完整更不利于保持土壤的可持续生产能力，对农业土壤肥力有明显的负面外部效应。

Vegetable-year average multiple cropping area of 8 million, not only to satisfy the millions of the urban population of the city of Baotou supply, and sold to Beijing, Tianjin, Shanghai, Erlian, and other places.

蔬菜年平均复种面积8万亩，不仅满足了包头市百万城市人口的供应，而且远销到北京、天津、上海、二连等地。

The experiment results show that this mode can increase multiple cropping index, tobacco income by over 2000 Yuan and maize yield by over 450 kg so as to reach the objective of in-creasing income and grain yield.

试验表明，该模式提高了复种指数，烤烟收入2000元以上，免耕玉米收入450㎏以上，达到钱粮双收的目的。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。