Analysis of Yield Gap and Limiting Factors for Cassava on the Farmland

LIANG Haibo; HUANG Jie; WEI Yunxia; LU Kundian; LIU Cuijuan

doi:10.16211/j.issn.1004-390X(n).2017.06.003

JOURNAL OF YUNNAN AGRICULTURAL UNIVERSITY（Natural Science） > 2017 > 32(6): 975-984. > DOI: 10.16211/j.issn.1004-390X(n).2017.06.003

LIANG Haibo, HUANG Jie, WEI Yunxia, et al. Analysis of Yield Gap and Limiting Factors for Cassava on the Farmland[J]. JOURNAL OF YUNNAN AGRICULTURAL UNIVERSITY（Natural Science）, 2017, 32(6): 975-984. DOI: 10.16211/j.issn.1004-390X(n).2017.06.003

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Analysis of Yield Gap and Limiting Factors for Cassava on the Farmland

1. Tropical Crops Genetic Resources Institute, Key Laboratory of Conservation and Utilization of Cassava Genetic Resources, Ministry of Agriculture, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China;
2. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;
3. Agricultural Extension Center, Wuming 530100, China;
4. Agricultural Science Research Institute, Hepu 536100, China

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Received Date: July 05, 2017
Revised Date: September 25, 2017

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Abstract

[Purpose] Our aim was to analyze the cause of yield gap and its limiting factors of cassava, and then to explore measures to narrow the gap.[Method] The yield gap of cassava both in Wuming and Hepu Counties of Guangxi Province was studied in this research.[Results] The results showed that average planting density and continuous cropping years of 25% the lowest yield farmer were significantly higher than those of other farmers. Only 25% the highest yield farmers' N, P₂O₅, K₂O ratios were fitted for recommended fertilization ratio of long-term fertilization trial, and the other farmers' N, K₂O ratios were lower than this ratio, also 25% the highest yield farmers' K₂O applications were significantly higher than those of the other farmers. More than 45% farmers had excessive fertilization, the average saving amount of fertilizer was 127.50 kg/hm², the saving potentials of phosphate, potassium and nitrogen fertilizer were 43.58%, 16.26%, 15.00%, respectively. The fertilizer efficiency was low, only 4.26%- 6.32% farmers reached a high yield and high efficiency. The investment/yield ratio reached the maximum when the yield reached 79.63 t/hm², after that, it showed diminishing returns with the increasing of yield. The cost of labor, especially spending on the harvest and management was the main limiting factors for yield gap.[Conclusion] Therefore, we have four suggestions for narrowing the yield gap of cassava.(1) Reasonable planting density.(2) The years of continuous cropping should not be more than three years.(3) The principles of fertilizer application should be in accordance with "tiny adjustment based on fertilization formula" and "if that longer continuous year of cropping is, the ratio of nitrogen and potassium fertilizer is higher", it recommending that, more nitrogen fertilizer and potassium fertilizer in basic fertilization, less nitrogen fertilizer and more potassium fertilizer in top-dressing fertilization, and to decrease phosphorus fertilizer and control nitrogen fertilizer and also potassium fertilizer in total could be effective nutrient management.(4) The input-output ratio should be promoted, and advanced mechanization replacing for labor should be spread in all cassava production.
- cassava,
- yield gap,
- continuous cropping,
- planting density,
- fertilization,
- economic benefits

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References

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