Guo Xiaoqian, Wu Qidi, Wang Luqi, Zhou Guisheng, Zhu Guanglong, Suliman Mohamed Suliman Eltyb, Nimir Nimir Eltyb Ahmed
College for Overseas Education, Yangzhou University, Yangzhou 225000, China.
China-Sudan Joint Laboratory of Crop Salinity and Drought Stress Physiology, The Ministry of Education of China, Yangzhou 225000, China.
Plants (Basel). 2025 Jan 2;14(1):102. doi: 10.3390/plants14010102.
Two-year experiments were conducted to assess the responses of yield and nutrient use efficiency of sorghum to nitrogen and phosphorus under saline soils. Three nitrogen rates (0, 180, and 360 N kg ha) and three phosphorus rates (0, 60, and 120 PO kg ha) were used in this study. Our results showed that nitrogen and phosphorus supply increased SPAD (leaf greenness, 5.0-29.1%), NSC (non-structural carbohydrates, 14.0-41.2%), nutrient accumulation (nitrogen: 14.1-50.0%, phosphorus: 11.8-41.5%, potassium: 13.7-28.2%), biomass (fresh: 10.8-29.3%, dry: 5.0-22.8%), yield (16.6-30.7%), and harvest index (2.0-9.8%) of sorghum at the maturity stage grown in saline soils but significantly decreased nutrient use efficiency. Combined application showed better performance on these attributes than sole nitrogen and sole phosphorus. The highest seed yield (5919 kg ha) was recorded at 180 N kg ha and 60 PO kg ha treatment, while the largest value of dry biomass (18,401 kg ha) was obtained at 360 N kg ha and 120 PO kg ha treatment. The Pearson analysis showed that seed yield had the highest correlation with aerial potassium accumulation, while dry biomass had the highest correlation with NSC as well as aerial nitrogen accumulation. A treatment of 180 N kg ha and 60 PO kg ha was recommended to be used in sorghum production in saline soils based on harvest index and nutrient use efficiency.
开展了为期两年的试验，以评估盐渍土条件下高粱产量和养分利用效率对氮和磷的响应。本研究采用了三种施氮量（0、180和360千克氮/公顷）和三种施磷量（0、60和120千克五氧化二磷/公顷）。我们的结果表明，氮和磷供应增加了盐渍土中生长的高粱在成熟期的SPAD值（叶片绿度，增加5.0 - 29.1%）、非结构性碳水化合物（增加14.0 - 41.2%）、养分积累（氮：增加14.1 - 50.0%，磷：增加11.8 - 41.5%，钾：增加13.7 - 28.2%）、生物量（鲜重：增加10.8 - 29.3%，干重：增加5.0 - 22.8%）、产量（增加16.6 - 30.7%）和收获指数（增加2.0 - 9.8%），但显著降低了养分利用效率。与单施氮肥和单施磷肥相比，氮磷配施在这些指标上表现更好。在180千克氮/公顷和60千克五氧化二磷/公顷处理下记录到最高种子产量（5919千克/公顷），而在360千克氮/公顷和120千克五氧化二磷/公顷处理下获得最大干生物量值（18401千克/公顷）。Pearson分析表明，种子产量与地上部钾积累的相关性最高，而干生物量与非结构性碳水化合物以及地上部氮积累的相关性最高。基于收获指数和养分利用效率，建议在盐渍土高粱生产中采用180千克氮/公顷和60千克五氧化二磷/公顷的处理。
