黑河地区玉米地膜覆盖节水增产灌溉制度的数学模型

通过一年的试验,初步得出参试各变量x_1(灌溉定额)、x_2(灌溉次数)、x_3(头水叶龄)和x_4(保苗株数)对产量y的多元回归模型。利用这一模型分析了各参试因子对产量的作用,并通过频数分析,筛选了地膜覆盖条件下玉米高于某一产量指标,同时限制灌溉定额或灌水次数的节水增产的优化措施组合。本文还分析了参试因子对玉米产量构成因素的影响,评价了地膜的节水效果和增温增产效果,初步探索了地膜玉米的节水增产机理。

A MATHEMATICAL MODEL OF WATER-SAVING AND YIELD-INCREASING IRRIGATING SYSTEM FOR MAIZE FARMING LAND COVERED WITH PLASTIC FILM OVER HEIHE AREA

After being tested for maize farming land covered with plastic film over Heihe area in 1989, a mathematical model of multiple regression equation of water-saving and yield-increasing irrigating system has been obtained already. The regression equation relates the maize yields to four experiment variables: irrigating water amount, irrigating times, the number of leaves of the first irrigating, and the number of plants per mu. Using the model the influences of various variables on the yield and the relative importance between various Variables are analysed, the effects of water-saving and temperature-increasing as well as yield-increasing with the plastic film covering and its mechanism have been also evaluated and approached in this paper.