However , in south asia , most farmers grow two or even three crops per year on their land and so it is necessary to take future yield maximization research one step - further so that information can be obtained on maximum yields for a cropping pattern 但在南亞,大多數農民一年種二到三季,因此有必要進行進一步的最高產量研究以獲得整個種植制度最高產量的資料。