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Subject: Soil Sciences × Author: Asha × End date: 2021 × Start date: 2020 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Nutrients dynamics under long term block plantations of different tree species
    (CCSHAU, Hisar, 2021-08) Asha; Parmod Kumar
    The physico-chemical properties viz. texture, soil pH, EC, OC, CaCO3, available nitrogen, phosphorus, potassium and DTPA-extractable micronutrients (Mn, Fe, Cu and Zn) of soil have been anaylzed under block plantations of different tree species viz. Pongamia pinnata, Prosopis cineraria and Ailanthus excelsa in Regional Research Station, Bawal, Rewari (Haryana). For this, soil samples from 0-15, 15-30, 30-60, 60-90, 90-120, 120-150 and 150-180 cm soil depths under tree canopies including site without plantations of these tree species (control) have been collected. Leaves samples of different tree species were also collected to analyze plant nutrient status. The soil was found loamy sand. In general, soil pH and EC decreased significantly under plantations as compared to control and increased with soil depth along profile under tree plantations as well as under control. Highest reduction in pH was recorded under Prosopis cineraria followed by Pongamia pinnata and Ailanthus excelsa. CaCO3 content decreased under tree plantations as compared to control and increased with soil profile. Available NPK and micronutrient content increased under tree plantations as compared to control. Maximum increase in nutrient content was recorded under Prosopis cineraria followed by Ailanthus excelsa and Pongamia pinnata. However, nutrient status decreased with increasing soil depth. The organic carbon content increased significantly under different tree species as compared to control and decreased with soil depth. It was recorded that percent N, P and K content was highest in leaves of Prosopis cineraria followed by Ailanthus excelsa and Pongamia pinnata. Micronutrients viz. Mn, Fe, Zn and Cu content were also found highest in leaves of Prosopis cineraria followed by Ailanthus excelsa and Pongamia pinnata. It was concluded that tree plantations helped in overall improvement of soil nutrient status and maintained its fertility.