论文部分内容阅读
为研究计算作物系数寻找到简单便捷方法,通过便于测量及具有地域差异性的植株高度来计算作物系数经验公式研究提供一定基础;同时为云南地区马铃薯植株精准灌溉制度提供研究基础及其参考。通过滴灌条件下大田种植马铃薯试验研究方法,试验数据拟合植株高度与FAO-56修正K值、实测K值的模型,分别为四次多项式和三次多项式,马铃薯植株高度与实测作物系数多项式更简单且拟合度更高;分析马铃薯植株高度变化速率最快时期分别与FAO-56修正K值和实测k值最大时期相差天数,为3 d。得出:(1)在今后研究简单作物计算中,植株高度是一个主导因变量,它能解决FAO-56 K值的地域差异性,用植株高度计算K值将会更接近实测K值及其计算式会更简单,为简单方法提供依据。(2)通过FAO-56修正K值研究马铃薯作物需水及其灌溉制度,在灌溉时间上,通过FAO-56计算出来确定的灌溉时间,尤其是在马铃薯需水关键期,应提前3 d进行灌溉。
In order to find a simple and convenient method to study and calculate crop coefficient, we can provide a basis for the empirical calculation of crop coefficient by measuring height and plant height with regional differences. At the same time, we provide the research basis and references for precision irrigation system of potato plants in Yunnan. According to the method of field experiment of potato under drip irrigation, the test data fitted the model of plant height, FAO-56 corrected K value and measured K value to quadratic polynomial and cubic polynomial respectively. The plant height of potato and the measured crop coefficient polynomial are simpler And the fitting degree was higher. The highest number of days when the highest rate of change in potato plant height was compared with the maximum value of k-value and the corrected value of FAO-56, respectively, was 3 days. (1) Plant height is a dominating variable in the study of simple crop in the future. It can solve the geographical difference of FAO-56 K value. Calculating K value with plant height will be closer to the measured K value and its The formula is simpler and provides the basis for simple methods. (2) To study the crop water requirement and irrigation system of potato by FAO-56 amended K value. The irrigation time calculated by FAO-56 during irrigation time, especially in the critical period of water requirement of potato, should be carried out 3 d irrigation.