El-Hedek, K.S , Mona H. M. Kenawy1 and K. Y.
Farroh
( 2021). Studies the changes on phosphorus fractions in Soils under application of hydroxyapatite Nanoparticles and superphosphate as a phosphorus
Fertilizers
RESEARCH ARTICLE BIOSCIENCE RESEARCH, 2021 18(1): 838-855.
Abstract: A laboratory incubation experiment and pot experiment were conducted at Agricultural Research Center at Giza, Governorate to investigate the effects of hydroxyapatite nanoparticles (HANPs) and superphosphate fertilizers on soil phosphorus fractions under three types of soils. As well as their effect on dry weight, concentration and uptake of phosphorus of maize plants under different soil type. Laboratory and pot experiments were carried out during summer season 2018. In incubation experiment, phosphorus was added at two levels (40 and 80 mg kg-1) and soil samples were taken at five time intervals (1, 15, 30, 60 and 90 days) and analyzed for phosphorus fractions using extraction procedure. Results of this study showed that, the distribution of phosphorus among each fraction in studied soils followed the order of HCl-P (Ca-bound)< Olsen-P (available-P) < NH4Cl-P(loosely sorbed P) < NaOH-P (Fe- and Al-bound). The content of all phosphorus fractions were higher with application of nano fertilizer compared to superphosphate and decreased gradually with the increase of incubation time. From the obtained results in our studies we can arrange the p fraction according to the percent of the relative decreased with incubation time as follows NaOH-P< NH4Cl-P< HCl-P< Olsen-P in sandy soil. But, in calcareous soil taken the follows order Olsen-P < NH4Cl-P< NaOH-P< HCl-P.As for, clay soil the percent of the relative decreased as follows NH4Cl-P< Olsen-P < NaOH-P< HCl-P. Multiply correlation coefficient and multiply regression equation showed that phosphorus fractions content were negative correlated with time of incubation and positively correlated with rate of phosphorus. The pots experiment showed that relative increased in dry weight, concentration and uptake of phosphorus of maize plants were 31.7% , 25.1%, 21.7% and 18.2%, 44.9 %, 35.9 % with application of nano (mean of three type of nano fertilizers) and superphosphate fertilizer compared to control treatment, respectively. The relative increased in dry weight, concentration and uptake of phosphorus of maize plants grown in clay and calcareous soil compared to those grown in sandy soil were 30.4, 46.4 and 63.5% for clay soil and were 10.9, 34.8 and 42.9% for calcareous soil, respectively. The available phosphorous content in soil after harvest of maize plants is much higher with nano fertilizer treatment than both of superphosphate and control soil. The relative increased in available phosphorus as application of nano fertilizer and superphosphate compared to control treatment were 43.7 and 28.8% for sandy soil, while were 31.5 and 14.6% for calcareous soil and reach about 36.0 and 18.9% for clay soil, respectively.
Keywords: (fraction, incubation, nano fertilizer, phosphorous , types of soil.)
