Thus the profit and loss rates were +7.08% and +23.34% in wheat-rice and rape-rice rotation of sandy loam field, and +29.79% and +23.54% in wheat-rice rotation of loamy sand field, respectively.

• 其中，砂壤土试验地麦-稻和油-稻轮作下盈亏率分别为+7.；08%25和+23