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(shù)農(nóng)民一年種二到三季,因此有必要進(jìn)行進(jìn)一步的最高產(chǎn)量研究以獲得整個(gè)種植制度最高產(chǎn)量的資料。