【摘要】 <正> (一)有利的自然因素和生产条件肇州县位于松嫩平原的西南部,海拔130～228米。光照充足,年日照时数为2899小时,太阳年总辐射量120千卡/cm~2,生育期间(4～10月)为72.9千卡/cm~2。年平均气温3.6℃,≥10.0℃积温2796℃;昼夜温差大,无霜期为143天,有利作物生长。夏季雨多,气温高,6～8月降水量300.3mm,占年降水量的69.1%,4～9月份降水量为401.6mm,占年降水量的92.4%,雨热同季,为作物的正常生育提供了极有利的条件。更多还原

【Abstract】 Through investigation and research of rainfed agriculture in Zh-aozhou County in the arid and Semiarid areas of Heilongjiang Pro-vince,such impontant problems were analysed in this paper as localfavourable natural conditions and spring drought hindering agrieul-rural production;(2)the existing conditions of agroecological en-vironment,irrational local agroecologieal structure with low ecologicalfunctions,the imbalance of N,P,K cycle and low efficiency of ener-gy conversion in farmland ecosystem.Finally,some suggestions forthe improvement of agricultural production in the arid and semiaridareas have been advanced in this paper:(1)Irrational agroecological structure will be improved.Farmlandswill be converted into plantation for planting trees and grasses so asto raise more animals.Grassland or steppe should be renewed so asto expand sown areas of fodder crops,economical crops and greenmanure crops so as to achieve the comprehensive development of ag-riculture,forestry and animal husbandry.(2)The productivity of farmland ecosystem should be raised bythe increase application of organic fertilizers and chemical fertilizersand practising rotation of food crops and fodder crops to better sollfertility.(3)Natural rainfall should be utilized to the fullest extent,anda good job must be done in storing rainfall water,preserving soilmoisture and droughtresistanee so as to bring productive effects ofrainfall water into full play.更多还原