文档介绍：摘要
本文针对宁夏中部干旱带压砂地亟待解决的节水补灌问题,立足宁夏中部干旱带中卫市香山乡红圈子村试验与示范基地,采用试坑和桶栽试验方法,以局部灌溉技术、计算机应用技术和应用数学等作为研究手段,对宁夏中部干旱带压砂地两瓜的水分生产函数和最优土壤水分下限指标进行了较系统的研究,现将主要研究成果概括如下:
、水分生产函数和节水补灌土壤水
分下限指标进行了综述,了解了国内外发展动态和发展趋势。 、同一肥力、同一初始含水率、同一品种条件下,采用试坑和桶栽两种试验
方法,对压砂地西瓜不同生育时期有限补水与产量的关系—水分生产函数进行了试验。通过试验,得出:,参考作物腾发量为653mm,;,参考作物腾发量为653 mill,;在生育期缺一水的处理条件下,缺苗期水减产28%,缺伸蔓水减产11%, 缺开花坐果水减产12,缺膨大初期水减产26%,‰%, 减产排序情况是:苗期(大)>膨大初期>开花坐果期>伸蔓期>膨大中期>膨大后期(小);建立
了压砂地西瓜水分生产函数的乘法模型和加法模型,由水分生产函数模型的敏感指数看出,西
瓜各阶段对水分敏感程度为:苗期-÷膨大初期_开花坐果一伸蔓期_膨大中期一膨大后期。 、同一肥力、同一初始含水率、同一品种条件下,采用试坑和桶栽两种试验
方法,对压砂地话瓜节水补灌土壤水分下限指标进行了试验。通过试验,得出:,参考作物腾发量为653mm,;,参考作物腾发量为653mm, 1 1。压砂瓜各生育阶段适宜水分下限指标(占田间持水量百分数):苗期40%、伸蔓期50%、开花结果期50%、膨大初期50%、膨大中期50%、膨大后期40%。
关键词:压砂地,西瓜局部有限补灌,水分生产函数,土壤水分下限,非充分灌溉
Abstract
The paper aimes at the technique of water-saveing supplied irrigation of gravel—mulched field which should be solved immediately in add regiOIlS of NingXia central paper depends Oil water-saving supplied irrigation experiment and model field at Xiangshan township of Zhongwei City
where belongs to add regions of Ningxia central experiment adopt contrast test method
between two types of cropping patterns that is test pits and barrel plant,with research methods of the local irrigation puter application technology and applied mathematics,
such as on the central add Ningxia soil water deficit on water pressure to the impact of sand,
combined with pay for technology,irrigation water quotas and the number of the best programs, focusing on the pressure sand and water production function model of moisture and pressure suitable for optimal sand melon lower limit of soil moisture indicators on key issues,the main research results will now be summarized as follows:
and water 011 the partial pressure of limited supplementary irrigation te