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Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (8): 1589-1595.DOI: 10.3969/j.issn.1000-2561.2020.08.012

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Yield and Economic Benefit of Potato in Winter under Different Release Periods of Controlled Slow Release Compound Fertilizers and Ratio of Nitrogen, Phosphorus and Potassium

LUO Qifeng,ZHANG Xinming,CHEN Lin,XU Pengju,PAN Song,HE Chunxi,CAO Xianwei()   

  1. Potato Research Laboratory, South China Agricultural University, Guangzhou, Guangdong 510642, China
  • Received:2019-10-21 Revised:2019-11-27 Online:2020-08-25 Published:2020-09-17
  • Contact: CAO Xianwei

Abstract:

The study was aimed to solve the problems of excessive fertilizer supply in early stage of winter potato growing, short of fertilizer in late stage and imbalance between supply and demand of fertilizer nutrients in Guangdong. A random complete block design was used with potato ‘Favorita’ as the test variety. The effects of controlled slow release compound fertilizers with different release periods on the yield and economic benefits of winter potato were studied under different NPK ratios. When the ratio of nitrogen, phosphorus and potassium was N∶P2O5∶K2O= 1.0∶0.5∶2.0, the total yield, relative yield increase, economic benefit and relative economic-benefit increase for CRF60d was the highest, being 56 550 kg/hm 2, 68.24%, 92 575 yuan/hm 2 and 69.12%, respectively, and that for CRF90d with N∶P2O5∶K2O=1.0∶0.5∶2.0 was 55 034 kg/hm 2, 63.73%, 88 186 yuan/hm 2 and 61.10%, respectively. Considering the factors such as yield and economic benefits, the suitable fertilization scheme for the main potato producing areas in winter in Guangdong is the controlled slow release compound fertilizer with 60-90 d release period, and the total NPK should reach N 240 kg/hm 2, P2O5 120 kg/hm 2 and K2O 480 kg/hm 2.

Key words: winter potato, slowly controlled release compound fertilizer, N P K ratio, yield, economic benefits

CLC Number: