甘蔗氮磷钾化肥效应研究

    Effects of Application of N, P and K Chemical Fertilizers on Sugarcane

    • 摘要: 【目的】在土壤有效磷和速效钾含量中上、碱解氮缺乏的甘蔗地,结合甘蔗养分吸收特性,探讨甘蔗氮磷钾化肥配施效应。【方法】设置不施肥、氮磷钾肥、不施氮肥、不施磷肥和不施钾肥处理,对甘蔗生长性状、养分含量、品质、产量和养分利用效率进行比较分析。【结果】不施肥、不施氮显著降低甘蔗的茎长、茎粗、单茎重、有效茎数、叶片及蔗茎氮磷钾养分含量和产量,不施磷显著降低单茎重、有效茎数、叶片及蔗茎磷含量和产量,不施钾显著降低甘蔗的茎长、茎粗、单茎重、有效茎数、叶片及蔗茎钾含量、蔗汁锤度和产量。氮磷钾配施甘蔗产量最高达 150.1 t/hm2,氮磷钾肥农学效率分别为 N 117.8 kg/kg、P2O5 189.4 kg/kg、K2O 57.5 kg/kg,氮磷钾肥料利用率分别为 27.1%、9.0% 和 35.6%。【结论】氮磷钾是甘蔗生长发育、体内养分累积、产量及品质形成的重要调控因素,在中低产田种植甘蔗时,更应重视氮磷钾肥的合理平衡施用。

       

      Abstract: 【Objective】Combined with the nutrient absorption characteristics of sugarcane, the effects of application of N, P and K chemical fertilizers on sugarcane were studied while soil contained deficient N, above the medium level of P and K.【Method】Four treatments were designed, including treatment with N-P-K fertilizers, treatments without N, P or K fertilizer, respectively, and a control treatment was conducted with no fertilizer. The growth characters of sugarcane, nutrient contents, quality, yield, and nutrient use efficiency were compared and analyzed.【Result】The control and treatment without N fertilizer significantly reduced the stem length, stem girth, weight of single stem, the number of effective stems, the contents of N, P, and K in leaves and stems and the yield. And treatment without P fertilizer significantly reduced the weight of single stem, the number of effective stems, the content of P in leaves and stems and the yield, while treatment without K fertilizer considerably decreased the stem length, stem girth, and weight of single stem, the number of effective stems,the content of K in leaves and stems, sugarcane-juice brix, and the yield. The highest yield of sugarcane was 150.1 t/hm2, the agronomic efficiency was 117.8 kg plant/kg N, 189.4 kg plant/kg P2O5, 57.5 kg plant/kg K2O that founded in OPT treatment. Meanwhile, the use efficiency of N, P, and K fertilizers were 27.1%, 9.0%, and 35.6%, respectively.【Conclusion】The N, P, and K are important regulating factors for sugarcane growth, nutrient accumulation, yield and quality formation. More attention should be paid to the rational and balanced application of N, P and K fertilizers in medium and low yield fields.

       

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