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- W1978325093 abstract "Abstract The effect of 50% shading and NO 3 :NH 4 ratio (0:100, 75:25, 50:50, and 25:75) in the nutrient solution on growth, yield, quality and N metabolism in hydroponically grown strawberry ( Fragaria × ananassa var Camarosa) was evaluated. Both fresh and dry weights of leaves were significantly lower when a high concentration of either NO 3 (100%) or NH 4 (75%) was the sole N source in the nutrient solution. In unshaded plants, increasing of both NH 4 and NO 3 ratio in the nutrient solution reduced photosynthetic (Pn) rate, however in shaded plants the reduction of Pn became more pronounced at a higher ratio of NH 4 in the nutrient solution. The yield in terms of fresh and dry weight of fruit per plant was significantly increased at the 75:25 and 50:50 (NO 3 :NH 4 ) treatments. Fruit size was significantly affected by the treatments, so that the biggest fruits in both shaded and unshaded plants were obtained under the 75:25 and 50:50 (NO 3 :NH 4 ) treatments. Total soluble solid (TSS) in unshaded plants was increased with increasing NH 4 ratio in the nutrient solution, however in shaded plants it was reduced at high NH 4 ratio in the nutrient solution. In both shaded and unshaded plants, higher concentration of NH 4 significantly reduced the post-harvest life of the fruits. The increase of tissue N concentration was nearly proportional to the NH 4 concentration in the nutrient solution. The activity of nitrate reductase (NR) was increased by increasing NH 4 from 0 to 50% and then reduced at a higher ratio of NH 4 in the solution. Shading increased NH 4 concentration so that the shaded plant had nearly twice as high NH 4 concentration in the leaves. The increase of NH 4 concentration induced by shading could be partially the reduction of NH 4 assimilate because of the shortage of carbohydrate." @default.
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- W1978325093 date "2008-05-01" @default.
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- W1978325093 title "Effects of shading and NO3:NH4 ratio on the yield, quality and N metabolism in strawberry" @default.
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- W1978325093 doi "https://doi.org/10.1016/j.scienta.2007.12.008" @default.
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