[Objectives] The soil phosphorus balance and potential risk of phosphorus loss under different phosphorus application rates in sugarcane red soil in Guangxi were evaluated to provide reference for scientific and ratio...[Objectives] The soil phosphorus balance and potential risk of phosphorus loss under different phosphorus application rates in sugarcane red soil in Guangxi were evaluated to provide reference for scientific and rational application of phos- phorus fertilizer and reduction of environmental pollution. [Methods] A field trial and simulated rainfall experiment were carried out. In the field experiment, five phospho- rus levels （0, 75, 150, 300 and 600 kg P2OJhm2） were set, the yield of sugarcane stems and leaves were measured, and their phosphorus content was determined to obtain aboveground P accumulation and P surplus in soil. After sugarcane harvest- ing, calcium magnesium phosphate and potassium dihydrogen phosphate were ap- plied to soil with different levels of phosphorus to conduct the simulated rainfall ex- periment based on monthly rainfall from May to September in Guangxi during 2000-2015. The leachate was collected to analyze the concentration and total amount of phosphorus to obtain the regression equations between available phos- phorus content in soil and the increase of phosphorus concentration in leachate. [Results] Sugarcane yield increased significantly when phosphorus application rate was 150 kg P：~OJhm2. When phosphorus application rate exceeded this value, the yield of sugarcane stems and aboveground part was also significantly higher than the treatment without phosphorus application, but the increase of yield was similar to the treatment with phosphorus application rate of 150 kg P2OJhm2. According to the relationship equation between phosphorus application rate and soil Olsen-P con- tent as well as the relationship equations between the increment of P concentration in leachate and soil Olsen-P content in the treatments with calcium magnesium phosphate and KH2PO4, the increment of P concentration in leachate was 0.02-0.04 mg/L when phosphorus application rate was 75 kg P2OJhm2; the increment of P concentration in leachate was 0.07-0.10 mg/L as phosphorus application rate was 600 kg P2OJhm2. [Conclusions] The reasonable application rate of phosphorus fer- tilizer for sugarcane is 150 kg P2Or/hm2. However, long-term continuous application of phosphorus fertilizer can promote the enhancement of available phosphorus con- tent in soil and increase the risk of phosphorus loss from sugarcane fields.展开更多
[Objective] Liquid special fertilizer for drip irrigation of sugarcane was de- veloped and the fertilizer patterns were explored in the production to provide techni- cal support for fertigation production of modern ag...[Objective] Liquid special fertilizer for drip irrigation of sugarcane was de- veloped and the fertilizer patterns were explored in the production to provide techni- cal support for fertigation production of modern agriculture. [Method] ROC22 was selected as experimental material, two formulas of liquid special fertilizer for sugar- cane developed by the cooperation between Guangxi Academy of Agricultural Sci- ences and New Orientation （Guangxi） Chemical Industry Co.,Ltd. were selected, namely, balanced 21-21-21 ~ TE of Xinfangxiang and hyperkalemic 13-6-39-TE of Xinfangxiang. Taking conventional fertilization as the control （CK）, two modes of ap- plying base fertilizer at the earlier stage ＋ fertigation in the tillering stage and ferti- gation in the whole growth period were set. [Result] The two modes of fertilization had not significant effects on the emergence of sugarcane, but applying base fertil- izer at the earlier stage ＋ timely applying water soluble fertilizer in the tillering stage was conducive to the tillering of sugarcane. Harvest results showed that the effects of different treatments on plant height and yield were significant, in which the yield of sugarcane under the treatment of hyperkalemic water-soluble fertilizer increased by 13.04% compared with conventional treatment, and the income increased by 4 500 yuan/hm2, [Conclusion] Liquid special fertilizer for drip irrigation of sugarcane signifi- cantly promoted the growth of sugarcane, moreover, under the same condition, the effect of hyperkalemic water-soluble fertilizer was better.展开更多
文摘[Objectives] The soil phosphorus balance and potential risk of phosphorus loss under different phosphorus application rates in sugarcane red soil in Guangxi were evaluated to provide reference for scientific and rational application of phos- phorus fertilizer and reduction of environmental pollution. [Methods] A field trial and simulated rainfall experiment were carried out. In the field experiment, five phospho- rus levels （0, 75, 150, 300 and 600 kg P2OJhm2） were set, the yield of sugarcane stems and leaves were measured, and their phosphorus content was determined to obtain aboveground P accumulation and P surplus in soil. After sugarcane harvest- ing, calcium magnesium phosphate and potassium dihydrogen phosphate were ap- plied to soil with different levels of phosphorus to conduct the simulated rainfall ex- periment based on monthly rainfall from May to September in Guangxi during 2000-2015. The leachate was collected to analyze the concentration and total amount of phosphorus to obtain the regression equations between available phos- phorus content in soil and the increase of phosphorus concentration in leachate. [Results] Sugarcane yield increased significantly when phosphorus application rate was 150 kg P：~OJhm2. When phosphorus application rate exceeded this value, the yield of sugarcane stems and aboveground part was also significantly higher than the treatment without phosphorus application, but the increase of yield was similar to the treatment with phosphorus application rate of 150 kg P2OJhm2. According to the relationship equation between phosphorus application rate and soil Olsen-P con- tent as well as the relationship equations between the increment of P concentration in leachate and soil Olsen-P content in the treatments with calcium magnesium phosphate and KH2PO4, the increment of P concentration in leachate was 0.02-0.04 mg/L when phosphorus application rate was 75 kg P2OJhm2; the increment of P concentration in leachate was 0.07-0.10 mg/L as phosphorus application rate was 600 kg P2OJhm2. [Conclusions] The reasonable application rate of phosphorus fer- tilizer for sugarcane is 150 kg P2Or/hm2. However, long-term continuous application of phosphorus fertilizer can promote the enhancement of available phosphorus con- tent in soil and increase the risk of phosphorus loss from sugarcane fields.
基金Supported by the Special Fund of Modern Agricultural Technology System Construction(CARS-20-3-5)the Project of Youth Fund of Guangxi Academy of Agricultural Sciences(Gui Nong Ke 2014YQ33)the Special Scientific Research Project of Guangxi Academy of Agricultural Sciences-Key Project Fund(Gui Nong Ke 2013YZ12)~~
文摘[Objective] Liquid special fertilizer for drip irrigation of sugarcane was de- veloped and the fertilizer patterns were explored in the production to provide techni- cal support for fertigation production of modern agriculture. [Method] ROC22 was selected as experimental material, two formulas of liquid special fertilizer for sugar- cane developed by the cooperation between Guangxi Academy of Agricultural Sci- ences and New Orientation （Guangxi） Chemical Industry Co.,Ltd. were selected, namely, balanced 21-21-21 ~ TE of Xinfangxiang and hyperkalemic 13-6-39-TE of Xinfangxiang. Taking conventional fertilization as the control （CK）, two modes of ap- plying base fertilizer at the earlier stage ＋ fertigation in the tillering stage and ferti- gation in the whole growth period were set. [Result] The two modes of fertilization had not significant effects on the emergence of sugarcane, but applying base fertil- izer at the earlier stage ＋ timely applying water soluble fertilizer in the tillering stage was conducive to the tillering of sugarcane. Harvest results showed that the effects of different treatments on plant height and yield were significant, in which the yield of sugarcane under the treatment of hyperkalemic water-soluble fertilizer increased by 13.04% compared with conventional treatment, and the income increased by 4 500 yuan/hm2, [Conclusion] Liquid special fertilizer for drip irrigation of sugarcane signifi- cantly promoted the growth of sugarcane, moreover, under the same condition, the effect of hyperkalemic water-soluble fertilizer was better.
