Evaluation of Major and Micronutrient Status of Acid Soils of Different Mango Orchards

摘要

The study involved distribution of nutrient elements in the acid soils of mango orchards. The objectives were to evaluate pH, organic carbon, and available macronutrient and diethylene triamine pentaacetic acid (DTPA)-micronutrient content in the soilprofile. Depth wise (0-30, 30-60, 60-90, and 90-120 cm) soil samples were collected from 27 different mango orchards comprising of three health levels (unhealthy, medium, and healthy) and three age groups (1-3 years, 4-5years, and 6-7 years). The pH ofthe surface soil ivas loiv and gradually increased ivith an increase in depth irrespective of health and age levels of the orchard. The pH was higher under the healthy orchard of 4-5years old (6.00 at surface layer) and recorded 30% more compared to control (unhealthy orchard of 1-3 years old). The organic carbon was highest of 6.3 and 6.2g kg~(-1) in A_3H_3 (healthy orchard of 6- 7years old) and A2H-3 (healthy orchard of 4-5years old), respectively, in the surface soil layer. The n content was higher under A jHj (healthy orchard of 1-3 years old), A_2H_3, and A_3H_3 (142.2, 138, and 138 kg ha'1, respectively, in surface layer); whereas P andK were higher under A_2H_2, and A3H3 orchard (12 and 380.5 kg ha~(-1), respectively, in surface layer) than other orchards. 'The DTPA-extractable Fe and Mn contents were high status throughout the soil profile; whereas DTPA-extractable Zn and Cu were higher under A2H_3 orchard (0.48 and 1.39 mg kg~(-1), respectively, in surface layer).