滴灌条件下不同水溶肥种类和配比对鲜食甘薯产量和品质的影响

doi:10.3724/SP.J.1006.2025.54021

Abstract

Abstract:

To investigate the effects of different nitrogen, phosphorus, and potassium (NPK) ratios on the yield and quality of table-use sweet potato (Ipomoea batatas (L.) Lam.) under drip irrigation, field experiments were conducted using two cultivars, Jishu 26 and Yanshu 25, at two sites: Pingyin and Sishui. The study examined the impact of water-soluble fertilizers on storage root yield, starch content, and soluble sugar content. Four treatments were applied: (1) a control (CK) with a basal application of compound fertilizer (N:P₂O₅:K₂O=15:15:15) at 450 kg hm?²; (2) F1, a drip-applied water-soluble fertilizer (N:P₂O₅:K₂O=16:6:36) at 150 kg hm?² applied at 20, 50, and 80 days after transplanting; (3) F2, a drip-applied water-soluble fertilizer (N:P₂O₅:K₂O=8:12:35) at 150 kg hm?² applied at the same intervals; and (4) F3, a combination of 150 kg hm?² of N:P₂O₅:K₂O = 16:6:36 at 20 days after transplanting and 150 kg hm?² of N:P₂O₅:K₂O = 8:12:35 at 50 and 80 days. The results showed that all water-soluble fertilizer treatments significantly improved yield and marketable root rate compared to the control, with performance ranked as F2 > F3 > F1. For Jishu 26, yields increased by 10.04%, 28.60%, and 19.23% under F1, F2, and F3 at Pingyin, and by 10.88%, 29.55%, and 21.29% at Sishui, respectively. For Yanshu 25, yields increased by 7.62%, 27.79%, and 20.12% at Pingyin, and by 8.52%, 29.17%, and 19.90% at Sishui under the same treatments. In the middle and late stages of growth, F2 significantly reduced vine length, leaf number, and aboveground biomass, while significantly increasing the dry weight of storage roots. Additionally, F2 resulted in significantly lower starch content and significantly higher soluble sugar content compared to the other treatments. Therefore, under the given experimental conditions (soil available nitrogen content ≤ 80 mg kg^?1) the F2 treatment—applying 150 kg hm?² of water-soluble fertilizer (N:P₂O₅:K₂O=8:12:35, humic acid content ≥ 3%) at 20, 50, and 80 days after transplanting—is recommended as the optimal fertilization strategy for table-use sweet potato production under drip irrigation.

Key words: sweet potato, drip irrigation, water-soluble fertilizers, yield, quality

ZHANG Hai-Yan, XIE Bei-Tao, DONG Shun-Xu, ZHANG Li-Ming, DUAN Wen-Xue. Effects of different types and ratios of water-soluble fertilizers on the yield and quality of table-use sweet potato [Ipomoea batatas (L.) Lam.] under drip irrigation[J].Acta Agronomica Sinica, 0, (): 0-.

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Effects of different types and ratios of water-soluble fertilizers on the yield and quality of table-use sweet potato [Ipomoea batatas (L.) Lam.] under drip irrigation

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