Combing with natural rainfall observation,a pot experiment was conducted to study the effects of different W-OH concentration(1%,3% and 5%)on soil water percolation and nitrate nitrogen leaching in cropland(soybean,maize,and garlic).The results showed that both precipitation and crop type had influences on water retention of W-OH.For light and moderate rain,3% treatment had the lowest leakage in maize pots showing the most significant water retention effect.For heavy rain and rainstorm,the water retention effect of W-OH was directly proportional to its spraying concentration.The water retention effect of W-OH in soybean and garlic pots was not affected by precipitation,and the influence law of soil water leakage by W-OH was similar.Compared with CK(without W-OH),water leakage increased with W-OH concentration increasing.The fertilizer retention effect of W-OH was proportional to its spraying concentration at the initial stage of crop growth and tended to be stable with subsequent rainfall leaching.During the observation period,both 3% and 5% treatments effectively reduced the nitrate leaching loss for maize and garlic pots,1% treatment also effectively reduced nitrate leaching loss for soybean pots.