一、红黄土的概念及分布京郊平谷、怀柔、密云、房山等山区县的低山、丘陵和山前冲积洪积扇地区,分布大面积的红黄土.红黄土地带是山区的主要粮食产地和果树的种植地,但由于红黄土的物理性质不良、养分含量较低,粮食产量不高,小麦单产平均约400斤,属中低产农田的土壤.红黄土的生产潜力还是很大的,只要对土壤进行培肥改土的措施,充分发挥土 First, the concept of red loess and the distribution of the northern suburbs of Pinggu, Huairou, Miyun, Fangshan and other mountainous areas of the low mountains, hills and alluvial fan alluvial fan area, the distribution of large areas of red and yellow loess.The red and yellow land is the mountain of the main food producing areas However, due to the poor physical properties of red loess, low nutrient content and low grain yield, the yield per hectare of wheat is about 400 kg, which is the soil of middle-low yield farmland. The production potential of red loess is still very high. Soil fertility and soil improvement measures, give full play to the soil