Fertilizer is applied into dry soil in random amounts , and irrigation water is applied to unevenly leveled fields , resulting in a sequence of ponding and dry knolls 化肥也是任意地撒到干地上，而灌溉水被倾注到没有平整过的田地里，结果有些地方积水成潭，有些地方干得裂缝。
Transportation of total nitrogen is meanly effected by precipitation , irrigation , rate of fertilizer application of agriculture , permeability of soil and thickness of unsaturated zone et al 总氮的迁移主要受到大气降水、灌溉水、农业施肥量、土壤的渗透性以及包气带厚度等因素的影响。
However , from a regional perspective , due to different attributes of water and land resources , the shortage of irrigation water in northern china will lead to regional food insecurity 但是从区域的角度看，由于水土资源禀赋差异，北方灌溉水资源的不足将成为今后区域粮食不安全的诱因。
The products are mainly exproted to some asia counties such as korea , japan , malaysia , singapore ect . and supplied to the famouse large international fast food catena organization for long - term cooperation 每个基地的土壤灌溉水进行理化检测，结果均符合国家无公害蔬菜基地和出口蔬菜各项指标的要求。
As i walked with him through the scattered fields he had inherited from his father , i asked what he needed to move out of poverty . “ control of water for my crops , ” he said , “ at a price i can afford 当我和拉曼一起走过他父亲遗留下来的零星农地时，我问他需要什麽来帮助他脱离贫穷，他说：以我可以负担的价格，购买控制灌溉水的装置。
The green team had other issues to grapple with such as parasites , irrigation , especially to the upper reaches of the 134 - hectare campus , and now that it is sufficiently habitable how to make the campus hospitable 问题还有不少，寄生虫要防治、灌溉水要引导等等，园艺组一一解决，才能成就中大山城的盎然绿意，成为全球有数的美丽校园，屡获诗人、作家品题称赞。
Collecting a large number of atmosphere , soil and irrigation water , using the method of monomial and composite pollution exponent , the general situation of grain early warning is studied and a grain early warning system is built 本文从粮食生产过程中的大气、土壤及农田灌溉水出发，运用单项污染指数与综合污染指数相结合的评价方法进行粮食生产的预警研究，构建了粮食本底安全预警系统。
The stem of helianthus tuberosus ( l . ) had the ability of containing high contents of na + and cl - , and selectively absorbed k + in high proportions seawater irrigation ; the above and tubers yields of helianthus tuberosus ( l . ) had n ' t decreased until at the 50 % proportions seawater irrigation where the yields decreased by 37 % and 32 % in contrast to freshwater - irrigated . it meant that through natural weather , reduction of yields was occurred by salinity of irrigation water but the reduction was not significant until the proportions of seawater in irrigation water were the same as 50 % or above it 海水灌溉下，菊芋的茎部具有明显的贮cl ~ - 、 na ~ +能力，在高浓度海水灌溉下菊芋整个植株对k ~ +具有较高的选择吸收性；菊芋地上部和块茎产量在30海水处理范围内，没有减产趋势，在50海水灌溉下减产幅度分别为37和32 ；可见，正常自然条件下的海水灌溉，对产量的影响主要和灌溉水的浓度有关，但只有在50处理下才显著减产，低于50产量并无差异。
The concept of sustainable development is incorporated into the connotation of water - saving irrigation . water - saving irrigation is the general term for all the technological measures taken , according to the law of crop water demand and the condition of local water supply , with the smallest possible input of water , to achieve the optimum comprehensive effect in economic benefit , social benefit and ecological and environmental benefit 研究的具体成果包括： 1 、提出了具有可持续发展概念的节水灌溉内涵节水灌溉是灌溉农业根据作物需水规律及当地供水条件，以尽可能少的灌溉水投入，实现经济效益、社会效益、生态环境效益最佳，而采取的各种技术措施的统称。
The concepts of " flexible water - saving " and " inflexible water - saving " are advanced , and the water - saving and production - increasing potentialities in northern china are calculated . on the theoretical basis of water - saving irrigation - including systematics , biology and physics - an analysis is made of the likely wastage nodes of irrigation water in the whole process of irrigation - starting from the water source to the uptake and utilization by the crops . in view of the two different cases , namely , sufficient water supply and insufficient water supply , the concepts of " flexible water - saving " and " inflexible water - saving " are advanced 2 、提出了“柔性节水”与“刚性节水”的概念，计算了我国北方地区节水潜力与增产潜力根据节水灌溉的系统学基础、生物学基础、物理学基础，分析了灌溉水从水源到被作物吸收利用的诸环节中可能浪费水的节点，针对水资源充足及不足二种情况提出了“柔性节水”与“刚性节水”的概念，计算了我国北方地区节水潜力与增产潜力。
