| The conversion of cropland to forestland has resulted in a considerable decrease of cropland.In this new situation,we carried out some experiments to demonstrate the benefit of fertilizing in the cropland,which can ensure the stability of the total grain yield by greatly increasing the grain yield per unit land.In addition,the product value and cash income of farmers had also been increased in Yangou watershed.In order to realize grain yield safety in the central section of hilly area of the Loess Plateau,we ought to ensure 0.14～0.20 hm2 basic farmland per capita,adjust the pattern of crop farming,build up a new cultivating system that could adapt to new crop varieties and water resources situation,choose and demonstrate selected seeds that can endure drought and increase yield,and increase the input of chemical fertilizer and organic fertilizer. |