苕子是我国黄河故道、秦岭北麓和南方果产区广泛栽培的一种果园绿肥作物。各地果园的生产实践证明,苕子做为果园绿肥有很多优点:(1)绿色体产量高,在一般栽培条件下,亩产1500～3000斤,在熟地上,每亩产量可高达6000斤。不论在沙土地或粘土地上种 Prickly heat is the old course of the Yellow River in China, the Qinling Mountains and the southern part of the fruit-growing areas of a green manure crop cultivation. Production practices of orchards in various places have proved that razor clam has many advantages as green manure in the orchard. (1) The high yield of green body under normal cultivation conditions can yield 1500-3000 kg per mu. On the mature land, the yield per mu can be up to 6000 kg. Whether in the sand or clay planting