نوع مقاله : مقاله کامل علمی پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد
2 عضو هیات علمی دانشگاه ارومیه
3 عضو هیات علمی دانشگاه گنبد کاووس
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In order to study the effect of low-molecular-weight organic (LMO) acids on phosphate rocks solubility for direct use in agricultural activities, a factorial experiment was conducted at completely randomized design in three replication. LMO acids were acetic, salicylic, malic, oxalic and citric at five concentration levels (0.5, 1, 2, 5 and 10 mM) and a control (no acid), on two phosphate rocks (RP) including igneous of Yazd (RPi) and sedimentary of Yasooj (RPs). Results showed that use of low-molecular-weight organic acids caused to release large amounts of phosphorus from both phosphate rocks. Among organic acids, citric and oxalic were more effective than others. Citric acid increased soluble P from 21 to 487 µg/L in RPi, and oxalic acid increased soluble P from 36 to 400 µg/L in RPs. With increasing concentration of organic acids from 0 to 10 mM, soluble P increased significantly in both phosphate rock. As soluble P increased from 21 to 888 µg/L in RPi and from 36 to 546 µg/L RPs. The sufficiency level of soluble P for most plants (200 µg/L) was found in the 0.5 and 5 mM of LMO acids for RPi and RPs, respectively. It is concluded that the release of phosphate from RP was affected by types and concentrations of organic acids, and composition of RP.
کلیدواژهها [English]
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