For example of the Shiyang River Basin along the Hexi Corrider,in Gansu province,made the imitial research of the major crop water production function and irrigation schedule optimal model,the results are following: 1Based on the related experimental datum gathered,drawing the relationship curve of several major crop yield and evapotranspiration,such as spring wheat,spring wheat-corn strip field,seed melon,sweet melon,cotton and flax and so on. The result shows these there:linearity and non-linear between crop yield and evapotranspiration.

本研究以甘肅省河西走廊石羊河流域為例，對其主要農作物的水分生產(chǎn)函數(shù)及灌溉制度優(yōu)化模型作了初步研究一级毛片精久久久久久久，取得了以下成果： 1 根據(jù)收集的有關試驗資料欧美又粗又大精品视频，繪制了春小麥、春小麥-玉米帶田美女b网站、籽瓜欧美性爽交大全、白蘭瓜、棉花和亞麻等幾種主要農作物產(chǎn)量與耗水量的關系曲線一级黄色视频免费网站，結果表明jjzzwww，產(chǎn)量與耗水量之間一般存在著線性與非線性的關系。