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首页> 外文期刊>Journal of Sensors >Effects of Subsurface Drip Irrigation on Water Consumption and Yields of Alfalfa under Different Water and Fertilizer Conditions
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Effects of Subsurface Drip Irrigation on Water Consumption and Yields of Alfalfa under Different Water and Fertilizer Conditions

机译：地下滴灌灌溉对不同水和肥料条件下苜蓿水消耗及产量的影响

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A field experiment was conducted for the purpose of examining the effects of different combinations of water and fertilizer applications on the water consumption and yields of alfalfa under subsurface drip irrigation (SDI). The results showed that the jointing and branching stages were the key stages for alfalfa water requirement. The water consumption had varied greatly (from 130 to 170?mm) during the growth period of each alfalfa crop. The water consumption during the whole growth period was approximately 500?mm, and the maximum water consumption intensity was 3.64?mm·d -1 . The overall changes in water consumption and yields during the growth period of the alfalfa displayed trends of first increasing and then decreasing. The sensitivities of the yields to water changes were much higher than that of fertilizer. The water use efficiency (WUE) of the alfalfa was determined to range from 1.68 to 3.20?kg·m -3 , and the rate of growth had ranged from 4.85% to 51.77%. The WUE and rate of growth of the alfalfa indicated the following trend: second crop??third crop??first crop. The results of frequency analysis based on the water-nitrogen-yield regression equation are the following: irrigation amounts of 142~165?mm and nitrogen application of 61~80?kg·hm -2 have a 95% probability of obtaining a hay yield of alfalfa of more than 11903?kg·hm -2 . These results suggest that SDI is a promising irrigation method, which can increase the WUE and hay yield of alfalfa under the condition of SDI within an appropriate amount of water and nitrogen fertilizer, and too low or too high water and nitrogen fertilizer will adversely affect the WUE and hay yield of alfalfa.
机译：进行了一个田间实验，目的是检查不同组合水和肥料应用对地下滴灌（SDI）的苜蓿水消耗和产量的影响。结果表明，连接和支化阶段是苜蓿水需求的关键阶段。在每种苜蓿作物的生长期期间，耗水量大大变化（从130至170？mm）。整个生长期间的耗水量约为500Ωmm，最大水消耗强度为3.64 mm·d -1。苜蓿生长期耗水期和产量的总体变化显示了首次增加，然后减少的趋势。水的产率的敏感性远高于肥料的敏感性。苜蓿的用水效率（WUE）确定为1.68至3.20？kg·m -3，并且增长率范围为4.85％至51.77％。 WUE和苜蓿的生长速率表明以下趋势：第二作物？＆？第三作物？＆？第一作物。基于水 - 氮屈服回归方程的频率分析结果如下：灌溉量为142〜165Ωmm，氮施用61〜80Ω·kg·hm-2具有95％获得干草产量的概率苜蓿超过11903？kg·hm -2。这些结果表明，SDI是一种有前途的灌溉方法，可以在适量的水和氮肥内的SDI条件下增加苜蓿的WUE和干草产量，水和过低或过高的水和氮肥将对此产生不利影响Wue和Hay产量的苜蓿。

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