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| | A mathematical model of ginger yield related to seed-ginger size, plant density, nitrogen and potassium applications was set up by calculation on an electronic computer using the quadratic orthogonal rotation design method, based which an optimum combining scheme of synthetic technique systems was screened, i.e., to get 45,000kg/ha of fresh ginger must sow 113,000~126,000 seed pieces with each at 87.4~108.9g and supply 393.9~525.3kg nitrogen and 459.05~551.1kg potassium per hectare. | | 本文采用二次正交旋转回归设计方法,经电子计算机运算,建立了密度、氮肥、钾肥和种块大小等四项技术措施与生姜产量关系的数学模型。应用计算机模拟,筛选出亩产2500~3000kg的综合技术体系优化组合方案。 | | 文摘来源 | | Water shortage is a globe problem and study of water-saving agriculture is a popular subject interested by experts at home and abroad. According to the water shortage situation and agricultural production feature of the Huang-Huai -Hai plain, the definition, standard of water-saving and the comprehensive technical system and the related measures of water-saving agriculture have been presented. Meanwhile, the approachs of carrying out the technical system of watersaving agriculture have also been explained... | | 水资源紧缺已成为全球的突出问题之一.国内外对节水农业的研究都给予高度重视。根据黄淮海平原水资源短缺现状和农业生产特点,提出了节水农业的涵义、标准及农业节水潜力、节水农业综合技术体系及其关系措施,同时阐述了实现节水农业技术体系的途径,以达到节水、增产的目的。 | | 文摘来源 | | Preservation and maintenance of genetic diversity is an important obligation in animal husbandry.General criteria of extinction danger are outlined as well as specific symptoms to be observed in endangered animal breeds,Motivation and methods for the preservation of genetic diversity in farm animals are listed and discussed.In situ-and ex situ preservation of genetic resources have to ne applied in integrated system of maintaining endangered animal breeds.Biotechnology procedures bear important potentials i... | | 保存和维持家畜遗传多样性是畜牧业生产的重要内容和目标,我们不仅要定义出濒危家畜品种的标准,而且要对其特殊症状予以观察和了解,同时,应对家畜遗传多样性保存的动机和方法进行探讨,遗传资源的原位(situ)及移位(ex-situ)保存是一项综合的技术体系,其中生物技术发挥着重要作用,最后,介绍德国现已形成的家畜遗传资源保存的基本观点。 | | 文摘来源 | |   | | << 更多相关文摘 |
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