The study looked at how using straw mulching and planting green manure affects soil water, nutrients, and winter wheat yield in a dryland area in China. They found that these methods did not impact the wheat yield, but planting green manure decreased soil water storage. Green manure increased soil nitrate-N and available phosphorus, but had no effect on soil ammonium-N and available potassium. Overall, using straw mulching and green manure did not significantly change winter wheat yield, but did affect soil water and nutrient levels in specific ways.