How strawberry plants cope with limited phosphorus supply: Nursery-crop formation and phosphorus and nitrogen uptake dynamics

文献类型： 外文期刊

第一作者： Li, Hong

作者： Li, Hong;Li, Hong;Li, Hong;Li, Tingxian;Fu, Gang;Hu, Kelin

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关键词： crop P-nutrient management;limited-input horticulture;nursery-crop biology;plant P-N interactions;strawberry-nursery productivity

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.426； 五年影响因子：3.029 ）

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收录情况： SCI

摘要： Healthy, well-rooted planting stocks are important for profitable fruit production of strawberry (Fragaria × ananassa Duch.). Adequate nutrient inputs and crop-rotation practices are among the most important measures to insure a successful, rapid development of strawberry nursery plants. However, relationships between macronutrient use and strawberry-nursery-plant formation in different rotation environments are not well understood. Our objectives were to assess strawberry plant P: N nutrition and nursery development under various limited and unlimited P inputs applied at different growth stages and to examine how nursery plants cope with limited P inputs. The field studies were conducted in a wheat-ryegrass-ryegrass-strawberry (WRRS) system in 2008 and in another corn-ryegrass-ryegrass-strawberry (CRRS) system in 2009 in Nova Scotia, Canada. The nursery crop was cv. Strawberry Festival and the experimental treatments consisted of three mother-stock P (MSP) rates (0, 6.6, and13.2 Pkg ha ~(-1)) and five daughter-%%%plant P (DPP) rates (0, 13.2, 26.4, 39.6, and 52.8 kg P ha~(-1)), representing 0%-125% of the regional recommendations for strawberry nursery. The P treatments were arranged with three blocks in a split-plot design in each field. The results showed that the effects and interactions of the MSP and DPP treatments were significant (P< 5%) on whole-plant P and N acquisition and nursery productivity. Two-year whole-plant total P and N acquisition varied between (13.2 ± 2.0) kg P ha~(-1) and (46 ± 7.3) kg N ha~(-1) (n = 270) in both nursery systems. There was a quadratic regression relationship between nursery runners and daughter plants with plant P and N acquisition (0.33< R~2< 0.42, P< 5%). Soil pH levels declined with time and were positively correlated with nursery-plant formation. Too many runners (18-22 per mother stock) might reduce nurseryplant formation. Limited P inputs (37.5%-62.5% of regular recommendation) might result in a suitable plant P: N ratio (0.12-0.13) and adequate daughter plant-to-runner ratios (1.4-1.7) for optimum nursery formation (14-16 daughter plants per mother stock). Nutrient P was the single controlled factor influencing the N acquisition of nursery plants. High P inputs (> 39.6 P ha~(-1) or > 75% of regular recommendation) may harm the crops. Therefore, this study implies that lowinput horticulture can improve the nutrition management of strawberry nursery.

分类号： S1

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