山东农业大学80级毕业班董淑富等12人参加部分工作 山东苹果树约有半数以上种植在丘陵山地。多数果园土层薄、保水保肥力差,排水通气良好,肥力低,有机质含量多在0.3%以下。由于肥水供应不足,这是造成山东苹果园平均单产低的主要原因。因此,研究在这类土地上节肥水增产技术是有 Shandong Agricultural University graduated class 80 Dong Shufu and other 12 people to participate in part of the work of the apple tree in Shandong Province about half planted in hilly mountains. Most orchards of thin soil, poor water and fertilizer retention, drainage and well-ventilated, low fertility, organic matter content more than 0.3%. Due to insufficient fertilizer and water supply, this is the main reason for the low average yield of apple orchards in Shandong. Therefore, research in this type of land fertilizer and fertilizer production technology is there