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1 玉米制种面积下降原因 1.1 生产条件的改善,比较效益下降生产条件改善,制种比较效益下降是我省玉米面积下降的直接原因之一。 80年代以来,我省玉米生产经历了春改夏,配套栽培技术也有了长足的进步,生产性投入增加,如每亩施氮水平由过去的每667m~2 5～10kg增加到目前的15kg,高产田块达到25kg,加之商品玉米价格和劳动价格上涨,玉米制种相对大于大田生产来说,费工费时,投入较高,几乎是微利。如大田玉米单产400妇计
1 reasons for the decline in corn seed production 1.1 The improvement of production conditions, the relative decline in efficiency Improvement in production conditions, the reduction of seed production efficiency is one of the direct reasons for the decline in corn area in our province. Since the 1980s, corn production in our province has gone through spring and summer change. Companion cultivation techniques have also made great strides and increased productive inputs. For example, the level of nitrogen fertilizer per mu has been increased from the past 667m ~ 25 ~ 10kg to the present 15kg, High yield plots reached 25kg, combined with the price of corn and labor prices, corn production is relatively larger than field production, time-consuming and laborious, high investment, almost meager profit. Such as field corn yields 400 women