Effects of Different Quantities of Di-Calcium –Phosphate on P Uptake, P-use Efficiency, and Growth of Different Wheat Genotypes

Document Type : Research Paper

Authors

1 Scientific member of Dry land Institute

2 , Scientific member of Soil and Water Institute Tehran

3 Expert of soil science laboratory at Maragheh university

Abstract

Phosphorus changes into the Ca-P fractions in calcareous soils. The quantities of these P fractions increase in these soils by P fertilizer application. To determine P fractions in Maragheh area soils under different managements, sequential P extraction method was used. In this study, P uptake, P-use efficiency, and growth differences of various wheat genotypes were investigated by applying four levels of Di-calcium phosphate (0, 80, 160 and 320 mg/kg soil) to ten wheat varieties and genotypes (ََSardari, Sbn/1-64-199, Azar2, Pf82200/Sardari, 5291 Karaj 98-99, Agosta/Safied, Fenkank/15/Safied, Anza/3/Pi//Nar/Hys/Sfied, 87Zhong291, Ghazagestan).  The experiment was conducted in glasshouse conditions using factorial arrangement in completely randomized block design (CRBD), with three replications. The results showed that P fractions in different soil management systems differed significantly. Ca-P fractions were higher in forage-wheat and chickpea-wheat compared to the other treatments of soil management techniques. With higher amounts of Di-calcium phosphate in the soils, shoot and root weight and phosphorus uptake of different wheat varieties and genotypes increased significantly. All genotypes differed significantly in shoot and root weight, P uptake, P shoot and root concentrations, and P-use efficiency by using different quantities of Ca-P fractions. Sardari and Rasad or Fenkang had the highest root weight and, proportionally, higher P concentration in shoot and root compared to the other wheat genotypes. Azar2, Sbn, and Agosta had greater phosphorus use efficiency i.e produced more shoot and leaf for every unit of absorbed P, leading to increased shoot weight. The results suggest that the amount of P fractions differ in different soil management systems. With increasing Ca-P fraction, P uptake and growths of wheat genotypes and varieties increased. It was found that the wheat genotypes with higher root growth/weight absorbed more P and had enhanced P-use efficiency. 

Keywords


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