ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Accurate estimation of reference evapotranspiration (ETo) is the basis of irrigation water management. When weather data is lacking or only temperature data is available, ETo has to be estimated with limited weather data. An attempt was made to estimate daily ETo by using temperature-based and radiation-based methods, i.e., Penman—Monteith temperature method (PMT), corrected PMT method (PMTcor), HG equation, modified HG (HG—M1, HG—M2), Thornthwaite equation and Irmak equation, corrected Irmak equation (Irmakcor), McGuinness Bordne equation (M—B). These equations were evaluated against the PM model in Xinxiang. When using the PMT method to estimate ETo, the adjustment of Tmin for estimating Tdew was adopted, when using the Irmak equation, the multiple linear regression was adopted to modify this equation. Results showed that the performance of PMT, PMT-cor, HG, Irmak and Irmak-cor methods were similar, which got the best ETo estimation with coefficient of regression (b) and determination (R2) around 1.0, relative error RE＜20%, index of agreement d＞0.95, five models fitted the standard of good model. Crosscomparison of the five good models showed that Irmak-cor equation was the best method which had the highest accuracy in all models with b=1.00, R2=0.98, RMSE=0.17mm/d, RE=7%, d=1.00; secondly, the Irmak equation, with b=1.03,，R2=0.95, RMSE=0.31mm/d, RE=12%, d=0.99. The precision of five models was in turn as Irmak-cor, Irmak, PMT-cor, PMT and HG equation. When considering the precision of the formula, the Irmak-cor equation was the best-suited equation for estimating ETo among the methods, but it was likely more appropriate to use HG equation, due to it was easy to compute and no requirements of temperature adjustment.