(一)本省中部和西部干旱地区,秋收后在整个漫长的冬季直至来春播种时期(10—5月)雨量极少(85—140mm),不及全年降水量的三分之一,加之,春季气温日增,春风转剧,耕地土壤水分蒸发显著,地表干土层即迅速加厚,有时竟达15mm 左右。如耕作技术不当或错过农时,土壤墒情,即有稍纵即逝之虞,严重影响适期播种。有时即或播下种子,也常常导致保苗率低或苗期生育不良,严重时须进行毁种。年来造成了极大损 (I) Rainfall in the central and western arid regions of the province after harvest is extremely small (85-140mm) during the long winter (up to the spring) seeding period (October-May), less than one-third of the annual precipitation. In addition, spring Temperatures increased, the spring drama, soil arable land evaporation is significant, surface soil quickly thickened, and sometimes as much as 15mm. If improper farming techniques or missed farming, the soil moisture, that is, the risk of fleeting, seriously affecting the appropriate sowing. Sometimes sowing or sowing seeds often results in low seedling rates or poor fertility at seedling stage, and devastating in severe cases. Years have caused a great loss