Stubble type effect on soil nutrition

To determine the effect of stubble type (wheat, peas and canola) and load (from Decile 2, 5 and 8seasons) on subsequent soil and crop nutrition.本研究旨在明确作物残茬类型（小麦、豌豆、油菜）以及取自8个季节第2、5、8十分位组的载荷量对后续土壤与作物养分的影响。