Study On Cultivation And Supporting Technology Of Anniversary Pitch-Film For Spring-Corn In Longdong Dryland

As a major grain-feed crop , corn has centuries-old cultivation history. Every year its sowing area is about 100'000 hm². But its yield is always low because of drought and low soil temperature in spring and summer. With progress of scientific technology , film cultivation broke through traditional cultivation skill, obviously increased production level. So the sowing area of corn's film cultivation has been above 80'000 hm² . But we discovered that film planting still had much deficiency . Though it increased soil temperature and preserved soil moisture , film skill didn't settled any questions as low soil moisture during spring sowing , a little collecting-rain on umbo ridge, serious vicarious sowing and inconvenient fertilizing and weeding .From increasing corn's growing environment , cultivation condition and precipitation availability , In this title we organically combined fullow collecting-rain with film skill . Based on regular film cultivation ,We carried out experiments research on cultivation and supporting technology of anniversary pitch-film for spring-corn in Longdong dryland. The results indicates that this technology has better socioeconomic performance and application outlook. It should be vigorously developed as a new cultivation measure of saving water.The research adopted small spot experiment on different treatment level which repeated many times in many spots . These spots belong to random arrangement on farm and contrastive experiments and demonstration . This research has been carried out for three years . The following results:(1) The research affirmed that the cultivation style has prominent effect on collecting-rain , preserving and raising soil moisture. Compared with regular film cultivation , anniversary fullow-film may lift moisture content of plough layer 0.99-2.26 percent;moisture content of 20-40cm plough layer 0.44-0.58 percent.(2) The research affirmed that the cultivation style has "hotbed efficiency" and tested that it may obviously increased and preserve soil temperature , especially soil temperature of deeper layer . Compared with regular cultivation , the cultivation style may averagely increase 5cm soil layer 0.4℃;20cm soil layer 0.9℃ .(3) The experiments offered the best fertilizing technology of the cultivation style . In other words we should manure N 105kg/hm²(2/3 seed fertilizer ,1/3 top application )and P₂O₅ 75kg/hm²(basic fertilizer )in proportion to N: P₂O₅ =3:2 .(4) The experiments confirmed that the optimum sowing time of the cultivation style is April 20th-25th and the best and the optimum density is 67500 hill/hm² .(5) The research pursued that the best economic weeding skill of the cultivation style isusing black sensitive film .(6) The experiments analysed the principle of corn's increase production on the cultivation style . It summed up and offered the criterion of cultivation technology on the style . It also offered skill assurance for corn's production in Longdong dryland with applicability.(7) Its yield sensitivity is notable . Compared with the yield 8949kg/hm2 of regular film cultivation , the average yield 10428kg/hm2 of anniversary fullow-film cultivation will increase 1479kg/hm2 with rate of yield increase 16.53 % .(8) Its social economic bebefit is notable. Corn of 2448.1 hm2 were planted in demonstration field. Its production value newly increased 3550.4641 thousand yuan and its net return newly increased 3550.4641 thousand yuan.In general, this is a new and practical water-saving technology for agricultural production of dryland. It should be extended with great effort due to its reliable target and good maneuverability.