Recommended NPK Fertilization and Partial Replacement with Organic Manure for Sweet Potato Cultivation in Fujian

LI Juan; ZHANG Licheng; ZHANG Hua; ZHANG Shichang; PAN Zhucai; ZHANG Minsheng; LIN Mingxian; ZHANG Mingqing

doi:10.19303/j.issn.1008-0384.2022.008.002

Volume 37 Issue 8

Aug. 2022

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Article Navigation > Fujian Journal of Agricultural Sciences > 2022 > 37(8): 968-976

LI J, ZHANG L C, ZHANG H, et al. Recommended NPK Fertilization and Partial Replacement with Organic Manure for Sweet Potato Cultivation in Fujian [J]. Fujian Journal of Agricultural Sciences，2022，37（8）：968−976 doi: 10.19303/j.issn.1008-0384.2022.008.002

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LI J, ZHANG L C, ZHANG H, et al. Recommended NPK Fertilization and Partial Replacement with Organic Manure for Sweet Potato Cultivation in Fujian [J]. Fujian Journal of Agricultural Sciences，2022，37（8）：968−976 doi: 10.19303/j.issn.1008-0384.2022.008.002

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Recommended NPK Fertilization and Partial Replacement with Organic Manure for Sweet Potato Cultivation in Fujian

doi: 10.19303/j.issn.1008-0384.2022.008.002

1.
Soil and Fertilizer Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian　350013, China
2.
Fujian Cropland Construction and Soil and Fertilizer Station, Fuzhou, Fujian　350003, China
3.
Nanan Agricultural Bureau, Nanan, Fujian　362300, China
4.
Yunxiao Soil and Fertilize Station, Yunxiao, Fujian　363300, China
5.
Zhangpu Agricultural Technology Popularization Station, Zhangpu, Fujian　363200, China

Received Date: 2022-04-24
Rev Recd Date: 2022-05-24

Available Online: 2022-08-29

Publish Date: 2022-08-28

Abstract

Abstract

Objective NPK fertilization and utilization of manure for partial replacement in sweet potato farming were optimized for the agriculture in Fujian. Method Based on field experiments, sweet potato growing fields in the province were classified. A ternary non-structural fertilization response model was constructed for each class to optimize the fertilization. Field tests and demonstrations were conducted to scrutinize and promote the recommended program. Result The 4 classes of sweet potato fields in the province included (1) high yield paddy, (2) medium yield paddy, (3) medium-to-low yield field, and (4) low yield field. The sweet potato plants were highly responsive to N fertilizer application on the fields of higher yield, but P or K tended to benefit more the plants grown on lands of lower yields. According to the fertilization response models, the economic applications averaged 160 kg·hm⁻² on N, 62 kg·hm⁻² on P₂O₅, and 212 kg·hm⁻² on K₂O in the ratio of 1:0.4:1.3. However, the recommendation for different classes of field differed significantly. By replacing 25% NPK in the recommended fertilizations (RF) with manure, on average a 13.0% increase on tuber yield and 1 802 yuan·hm⁻² increase on net revenue over RF were realized. In the 79 field demonstrations with RF, the application of N was reduced by 16.7% and P₂O₅ by 47.41% while K₂O increased by 79.3% which resulted in 7.9% rise on yield and 3 394 yuan·hm⁻² more on net revenue over what practiced by the farmers (FP). On the other hand, in the 16 field tests where 25% NPK fertilizers was replaced with manure, the average yield rose by 11.0% with 4 192 yuan·hm⁻² higher in revenue. Conclusion Although either RF or 25% NPK replaced by organic manure could significantly improve the sweet potato productivity and profitability, the use of organic manure to partially substitute chemical fertilizer was deemed superior for the farming in the province.
- Sweet potato,
- field classification,
- fertilizer,
- organic manure,
- recommended fertilization,
- fertilization model

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References(34)

References

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