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1987年依安县试验种植了地膜覆盖甜菜1809.8亩,结果平均亩产1600多公斤,比同条件下的直播甜菜增产42.4％,含糖提高0.38度,亩产糖增加45.9％。分析其增产原因有:①覆膜可提高土壤温度,因此可比直播的提前6天出苗,可延长生育期12夭,增加积温120℃,日照增加50.3小时;②由于地膜覆盖可提墒、保水,促进土壤微生物的活动,为甜菜生长创造了良好的生态环境,因此生长势强,平均株高较直播增加10厘米,叶片数较直播平均
In 1987, Yan’an County experimented planting 1809.8 mu of plastic mulching beets, with the result that the average mu yield was over 1600 kg, 42.4% more than the direct seeding beet under the same conditions. The sugar content increased by 0.38 degrees and the sugar yield per mu increased by 45.9%. Analysis of the reasons for the increase: ① film can increase the soil temperature, so than the live broadcast 6 days in advance to give birth, can extend the growth period of 12 days, increase the accumulated temperature 120 ℃, sunshine increased 50.3 hours; ② due to mulching can increase soil moisture, Promote soil microbial activity, create a good ecological environment for the growth of sugar beet, so strong growth potential, the average height of the plant increased by 10 cm compared with direct seeding, the number of leaves than the average live