Sierozem is an important soil resource in Ili River valley. There is 15.04×10~4 hm~2 Sierozem in Qapqal County and 3.69×10~4 hm~2
of them are irrigated sierozem. The
character of fertility is as follows:(1) The soil is abundant in potassium but short of nitrogen and phosphor. (2) The soil is abundant potential nutrient. (3)After plantation and
fertilization of sierozem, the soil fertility was improved obviously, but the nutrient of phosphor and potassium tended to decline. (4) The soil is short of Zn and Fe but rich in Cu. (5) The nutrient content of the upper layer is higher than that of the lower layer. The fertilizing method is as follows:(1) The pasturage will be developed in agricultural region and more organic fertilizer will applied to the soil. (2) More leguminous plants will be added as stubble crops with the aim to improve the fertility soil and increase the economical income. (3)The travopolye crop rotation system will be spread. The rotation of green manwre, alfalf, grain crop and industrial crop will be arranged in a planned way. (4) The technique of balanced fertilization will be spread.