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在广西坡耕地赤红壤下,研究不同施肥处理对养分利用效率、甘蔗生长、单茎重、生物产量、蔗茎产量、锤度及经济效益的影响,寻求低成本、高经济效益和养分利用率的施肥模式.设5个处理,(1)不施肥的甘蔗对照(CK),(2)甘蔗常规施肥(SF),(3)80%的甘蔗常规施肥量(SF80%),(4)60%的甘蔗常规施肥量(SF60%),(5)甘蔗常规施肥+农家肥(SF+N).(SF+N)处理的甘蔗茎粗、株高、地上部干物质含量、生物产量、甘蔗产量、锤度、经济效益均最高,分别为33.93 mm、368.6 cm、82.78%、149.92 t/ha、139.58 t/ha、18.83BX、69 792.45元/hm2,与其它各处理相比,差异均达极显著水平;与SF处理相比,SF60%处理提高了N、P利用率,分别提高了4.87%、1.63%;与SF处理相比,(SF+N)处理提高P利用率42.04%,SF80%处理提高K利用率4.12%.(SF+N)处理的甘蔗产量和经济效益均最高.甘蔗K利用率最高的是SF80%处理,甘蔗N利用率最高的是SF60%处理.因此,在广西较肥沃的坡耕地上种植甘蔗,可以适当的减少化肥施用量,配施农家肥可以提高产量和经济效益,也能提高养分利用率.
Under the red soil of slope land in Guangxi, the effects of different fertilization treatments on nutrient use efficiency, sugar cane growth, single stem weight, biomass, cane yield, brix and economic benefits were studied to find out the low cost, high economic benefit and nutrient utilization (1) fertilization without CK (CK), (2) conventional fertilization of sugarcane (SF), (3) 80% conventional fertilization of SF (80%), and (SF60%), (5) conventional fertilization of sugar cane + SF + N (SF + N), the plant height, shoot dry weight, shoot biomass, The yield, brix and economic benefits were the highest, which were 33.93 mm, 368.6 cm, 82.78%, 149.92 t / ha, 139.58 t / ha, 18.83BX and 69792.45 Yuan / hm2, respectively, Compared with SF treatment, SF60% treatment increased N and P utilization rates by 4.87% and 1.63% respectively. Compared with SF treatment, SF + N treatment increased P utilization by 42.04% and SF80 % Treatment increased K utilization rate of 4.12%. (SF + N) treatment of sugarcane production and economic benefits are the highest .There are highest utilization rate of sugarcane K is SF80% treatment, the highest utilization rate of sugarcane N is SF60% treatment. Planting sugarcane in Guangxi sloping land more fertile, can be appropriate to reduce the amount of chemical fertilizer, manure fertilizer can increase the yield and economic benefits, but also can improve nutrient utilization.