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1984～1985年,在无灌溉的中等肥力的旱坡地种了两造新植蔗,供试品种:桂糖11号、台糖134,终止施氮期分6、7、8月三个时期,亩施纯氮40斤,氮∶磷∶钾=3∶1∶2。观测不同止氮期对甘蔗生育、原料蔗产量和蔗糖份的影响。试验表明:不同止氮期对甘蔗的出叶速度,生长速度,原料蔗产量,蔗糖份及亩产糖量等差异均未达到显著水准,但蔗株开展叶数和株高,7、8月止氮的比6月的稍有增加,而原料蔗产量,蔗糖份和亩产糖量则以6月止氮的为高。因此,甘蔗6月终止施氮对蔗农和糖厂均能获得较高的经济效益。
Between 1984 and 1985, two new planted sugarcane varieties were planted on a moderately fertile arid slope without irrigating. The cultivars tested were Guitang No.11 and Taitou134, and ceased nitrogen application periods in June, July and August. The area of mu Applied nitrogen 40 kg, nitrogen: phosphorus: potassium = 3: 1: 2. The effects of different nitrogen removal periods on the growth of sugarcane, the yield of cane and the content of sucrose were observed. The results showed that no significant differences were found in leaf withdrawal rate, growth rate, yield of raw cane, sucrose content and yield per mu of sugar cane under different N periods, but the leaf number and plant height of cane were not significantly different. Nitrogen only slightly increased from June, while raw sugar cane yield, sugar content and yield per mu were higher in June than in June. Therefore, sugarcane termination of nitrogen fertilizer in June to sugar cane farmers and sugar can get higher economic benefits.