Abstract

SUMMARY A field experiment was conducted to determine the growth rates of Alhizia lebbeck (siris) grown under different methods of micro-catchment water harvesting in the Indian arid zone. Six micro-catchment water harvesting treatments were: control (only pitting), saucers of 2.5 m diameter, ringpits, trench-cum-mound, trench and mound and deep ploughing. The five water harvesting treatments were associated with significant increases in height and collar girth of Albizia lebbeck, compared to the control. Twenty-one months after planting, trees were 2.3 times taller in ringpits and two times taller in saucers and trench and mound than the control (P=0.001; F=9.8). Eighteen months after planting basal girth was 3.3, 3.0 and 3.8-fold higher, respectively in T3, T2 and T5 treatments than the control, (P=0.000; F=13.8). With advancing age of plantation, growth differences between the control and the above treatments decreased. Fifty four months after planting, the most growth was attained by the trees in ring...

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