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Paper Information

Journal:   HORTICULTURAL PLANT NUTRITION   spring-summer 2018 , Volume 1 , Number 1 #M00592; Page(s) 41 To 48.

Research Institute of Forests and Rangelands, Tehran, Iran

* university of Tabriz, Iran
Introduction: Phosphorus (P) is an important nutrient for the plant affecting many physiological functions in plants. Phosphite (PO33; Phi; valence of +3), a reduced form of phosphate (PO43; Pi; valence of +5), that are being widely marketed either as an agricultural fungicide or as a superior source of plant phosphorus (P) nutrition. Furthermore, pH of both nutrient and soil solution alter the availability of P by the plants. There is insufficient information concerning the use of phosphite in plant. It could be possible to use of phosphite and phosphate to improve the P nutrition of plants. Materials and Methods: An experiment was conducted to investigate the effect of phosphite and phosphate in different pH on yield, growth and P status in broccoli (Brassica oleracea var. italicacv. Fiorentino). The experiment was conducted with three pH levels (5. 5, 7, 8. 5) factorially combined with three P source levels (Pi, Phi and Pi& Phi). The plants were grown in black buckets containing 8 L of aerated nutrient solution for 10 weeks. At the end of experiments the plant were harvested to measure the agronomical and physiological characteristics. The concentration of P was measured in the recently matured expanded leaves. Results and Discussion: Results indicated that the growth of broccoli plants was affected by the form of P. Phosphite significantly reduced the yield of plant. In Phosphite treated plants immature heads (button-like flower heads) was observed. Likewise, Phosphite increased phosphorus and potassium concentration in the leaves, roots, Stems and heads. Both P and K concentration were significantly reduced by the increase pH level. The highest yield was observed in Pi& Phi with pH (5. 5) at 237 g plant-1. Phosphate (pH=5. 5) compare to Phosphite (pH=5. 5) increased by 75% in yield. The increase in Pi uptake in the Phi treatment plant caused increased in P concentration in leaves and growth reduction and phytotoxicity. The negative effects application of only Phosphite was strong inhibiting effect in fresh weight head. Despit of increased P concentration in Phosphite treated plant, it seems that P from Phosphite source has no effect on P functional in plants. Conclusion: The findings this experiment indicted that Phosphite alone could not be used as a phosphorus fertilizer for the plants. however, the combination of Phosphite and phosphate improves the growth of broccoli plants.
Keyword(s): Broccoli,Phosphite,Phosphate
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