Evaluation of Ber (Zizyphus mauritiana Lamk) based agri-horti systems under various tree root management practices on reclaimed Yamuna ravines.

摘要

Agroforestry, a traditional practice in semi arid tropics of India, to meet out domestic needs of fuel, fiber, fodder etc; usually suppresses crop yields due to competitive tree-crop interactions mainly through tree shade and root congestion. Five tree root management options [T₁: Tree planted in bottomless used bitumen drums of 90 cm height and 25 cm radius; T₂: Tree planted in polythene (120 micron thick) lined pits; T₃: Trenches (30 cm wide and 40 cm deep) in two sides of trees; T₄: Trees without root management and T₅: Crop without Ber trees] were evaluated in Ber+pearl millet-wheat sequence in semi arid Indo-Gangetic alluvium soils of Yamuna ravines (1998 to 2001). Trees planted in bottomless bitumen drums produced significantly higher fruit yield of Ber (7347 kg ha-1), tree volume (35.1 m3) and fire wood (21.8 q ha-1). All tree root management options improved crop yield over T₄ [wheat (3488 kg ha-1) and pearl millet (1833 kg ha-1)] which was equivalent to 13.76, 7.48 and 7.28% in wheat and 17.89, 10.64 and 7.86% in pearl millet under T₁, T₂ and T₃, respectively. However, tree root management options (except T₁) decreased Ber fruit yield than T₄ (6827 kg ha-1). Among tree root management options, T₁ produced significantly higher grain yield of pearl millet (2161 kg ha-1) and wheat (3968 kg ha-1) and also produced minimum reduction in pearl millet (5.30%) and wheat (6.48%) grain yields than sole cropping.