Amendments of Severe Saline-Sodic Paddy Land: Optimal Combination of Phosphogypsum, Farmyard Fertilizer, and Wood Peat
2023
Guokang Duan | Miao Liu | Zhengwei Liang | Mingming Wang | Haoyu Yang | Yang Xu | Tianhe Yu | Yangyang Jin | Jiafeng Hu | Junqing Liu
We aimed to determine the optimal combination of amendments to increase rice yields in saline-sodic soil. The effects of different proportions of phosphogypsum (P), farmyard fertilizer (F), and wood peat (W) across the main growth period of rice were studied. A total of 14 treatments were designed based on the &ldquo:3414&rdquo: fertilizer effect field experiment scheme, with 3 factors (P, F, and W) and 4 application levels per factor. Application of a combination of P, F, and W reduced soil pH and electrical conductance (EC) (p <: 0.05), increasing rice yields. The theoretical rice yield after treatment P2F2W2 (P 30, F 50, and W 30 t·:ha&minus:1) was 5819.20 kg·:ha&minus:1, which was 32.52-fold higher than that after P0F0W0 (P, F, and W, 0 t·:ha&minus:1). Panicle weight, number of total filled grains, total grain weight, and seed-setting rate were 9.76, 17.35, 32.11, and 3.96 times higher than those in the control treatment, respectively. Compared with the control P0F0W0 treatment, soil pH in P2F2W2 in 0&ndash:5, 5&ndash:10, 10&ndash:15, and 15&ndash:20 cm depth decreased by 12.69, 12.32, 11.18, and 10.70%, respectively, and soil EC was 1.06-fold, and 70.79, 49.30, and 47.76% higher, respectively. Overall, we found that the P2F2W2 treatment, with a combination of P, 29.09&ndash:32.38 t·:ha&minus:1: F, 40.36&ndash:46.97 t·:ha&minus:1: and W, 19.57&ndash:23.95 t·:ha&minus:1 was optimal in this experiment.
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