تأثير كربونات الكالسيوم، الأس الهيدروجيني و كمية الطين و الكربون العضوي في إدمصاص الفوسفات في التربة لبعض المزارع في وادي حضرموت

Abstract EN

This study was conducted to determine the effect of calcium carbonate, pH, the amount of clay on phosphate adsorption, and the effect of early fertilization of phosphatic fertilizer on the amount of fertilizer.

Three samples of surface soil (0-30 cm) were obtained from Al-Mashhad (Cotton) and (Sweiri) farms, Hadramout governorate, which differ in their content for: Total calcium carbonate ratio.

The amount of clay in its mechanical analysis.

Organic carbon.pH (pH).The samples were incubated at room temperature (24-28° C) and at varying concentrations of Monocalsumphosphate.

The correlation coefficient was used to find the statistical relationship between the adsorption and release of phosphorus.

The obtained results showed a strong negative relationship between phosphate and pH (correlation coefficient = 0.998).

And increase the amount of phosphate compacted when increasing the proportion of clay, as this relationship showed that by increasing the proportion of clay in the ground increases the maximum exchange capacity of phosphorus due to increased surface area, which leads to increasing the ability of soil to adsorption and there is an inverse relationship between the amount of calcium carbonate and phosphorus, The amount of calcium carbonate less phosphate in the soil (which can be used by the plant) decreases the amount of phosphate fertilizer (correlation coefficient of 0.251).