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首页> 外文期刊>Acta Physiologiae Plantarum >The right combination of N-P-K fertilization may mitigate salt stress in custard apple (Annona squamosa L.)
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The right combination of N-P-K fertilization may mitigate salt stress in custard apple (Annona squamosa L.)

机译：N-P-K施肥的正确组合可以减轻奶油苹果（Annona squamosa L.）的盐胁迫。

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摘要

Salt stress is the cause of low yield in many arid and semi-arid regions. Strategies to increase crop yields in salt stress conditions are very important, especially in systems with higher production costs, such as irrigated fruticulture. This study proposes to assess the photosynthetic efficiency and growth of Annona squamosa irrigated with saline water under different doses of nitrogen, phosphorus, and potassium fertilization. The assay was conducted in a greenhouse and consisted of two factors, which corresponded to two electrical conductivity of water (ECw) (0.8 and 3.0 dS m(-1)) and eight combinations of fertilization with nitrogen, phosphorus, and potassium ranging from 100 to 140 of the recommended dose, arranged in a 2 x 8 factorial scheme, with three replicates. Plants were evaluated for growth, chlorophyll a fluorescence, gas exchanges, and production over a period of 1 year. The photosynthetic efficiency in the vegetative stage of A. squamosa plants is the most affected by salt stress. Stomatal closure and damage to the quantum efficiency of photosystem II are the main factors responsible for the reduction of photosynthesis and growth. In the reproductive stage, A. squamosa plants acclimated to salt stress, with no effect of salinity on the photochemical efficiency and stomatal conductance, but the damage to photosynthesis was not reversed and contributed to reducing production. The fertilizer combination C6 (140:100:140 or 56:60:84 g plant(-1) year(-1) of N:P2O5:K2O) is recommended to mitigate salt stress and increase A. squamosa production.
机译：盐胁迫是许多干旱和半干旱地区产量低的原因。在盐胁迫条件下提高作物产量的策略非常重要，特别是在生产成本较高的系统中，例如灌溉果农栽培。本研究提出评估不同剂量氮、磷、钾施肥下盐水灌溉的番荔枝的光合效率和生长情况。该测定在温室中进行，由两个因素组成，分别对应于水的两种电导率 （ECw）（0.8 和 3.0 dS m（-1））和八种氮、磷和钾施肥组合，范围为推荐剂量的 100% 至 140%，排列成 2 x 8 析因方案，重复三次。在1年的时间里，对植物的生长、叶绿素a荧光、气体交换和产量进行了评估。鳞状芋植物营养期的光合效率受盐胁迫影响最大。气孔闭合和光系统II量子效率的破坏是导致光合作用减少和生长的主要因素。在繁殖阶段，鳞状红芨植株适应盐胁迫，盐度对光化学效率和气孔导度没有影响，但对光合作用的损害没有逆转，导致产量降低。建议使用肥料组合 C6（140：100：140% 或 56：60：84 g 植物 （-1） 年 （-1） 的 N：P2O5：K2O）来减轻盐胁迫并增加鳞状曲霉产量。

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