Results: Compared to DAP, lower quantities (19.6%) of P for PA-treated soil were required for producing optimum P concentration in soil solution, i.e. 0.2 mg P L-1 . The greenhouse study involved 32 P tracer technique to quantify the proportion of applied P derived by wheat from fertilizer or soil. The results showed that P derived from fertilizer was highest (47.5%) in PA placement, while the lowest (31.5%) was in DAP broadcast treatment. The field study also showed similar trends to that of the greenhouse study. The PA placement treatment resulted in highest (23.4%) phosphorus use efficiency, whereas the lowest one (17.1%) was recorded for DAP broadcast treatment.
Conclusion: PA proved to be a better P source than DAP for improving P content and achieving higher yield and recovery of applied P by wheat grown in alkaline calcareous soils. © 2016 Society of Chemical Industry.
Keywords: 32P isotope; Freundlich model; P uptake; diammonium phosphate; phosphoric acid.
Phosphoric Acid 85% is a multi-function agent, used for plant nutrition, pH adjustment and cleansing irrigation equipment (notably dripper lines) from lime precipitates. Haifa P is an efficient source of phosphorus for plants, providing 610 grams of readily available P2O5 per 1000g of the product. Haifa P is suitable for Nutrigation™ of greenhouse crops, open field crops and fruit trees.
- Highly-concentrated phosphoric fertilizer
- Consists of 100% plant nutrients
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Typical H3PO4 85% P2O5 61% Heavy metals <10ppm Organic matter 40 ppm Insoluble matter <23 ppm pH (0.1% solution) 2.3