Effects of nitrate to ammonium ratio on yield and nitrogen metabolism ofstrawberry (Fragaria x Ananassa cv. Selva)
2004
Taghavi, T.S.,Tehran Univ. (Iran). Horticulture Dept.)Babalar, M. | Ebadi, A.
Strawberry plants c.v. Selva was grown with four NO3: NW4 ratios, (7:0,6.5:0.5,6:1, 5.5:1.5 mM) at constant nitrogen concentration of 7 mM/L and constantpH of 5.8. Other essential elements were prepared for the plants adequately. Theeffect of different NO3 : NH4+ ratios on, yield, number of fruits, total nitrogenand nitrate content of different parts of the plants and, leaf nitrate reductaseactivity was determined. Nitrate reductase activity, during the vegetative growth,was affected by the nitrogen sources and maximum activity was shown in theratio of 6:1. The strawberry plants also showed higher nitrogen content in thisratio compared to the treatment lacking ammonium. Yield and number of fruits arehigher in nutrient solutions having both nitrate and ammonium. The strawberryplants need more ammonium than nitrate in the vegetative stage, ammonium mustnot exceed more than 50% of total nitrogen in the nutrient solution. Ammoniumalso improves yield a nitrogen content of strawberry tissues. Plant developmentalstages and environmental tuition will determine the best ratio nitrate toammonium.
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