Abstract
A field experiment was carried out during 3 winter seasons from 2000-01 to 2002-03 at Patna, to find out ef- fect of tillage practices, viz. zero tillage, bed planting and conventional, and irrigation levels, viz. 3, 5, 7 and 9 cm depth on rooting behaviour, yield and economics of wheat [(Triticum aestivum (L.) emend. Fiori & Paol.] in Usti- psamment soils. Root characters like area (10.5 cm2) and length (48.1 cm) were highest in bed planting, fol- lowed by conventional and zero tillage at tillering as well as flowering stages. Highest grain yield of 36.6 qlha was obtained in zero tillage, followed by conventional tillage (34.1 q/ha) and bed planting (31.5 qlha). lrrigation at 7 cm water depth resulted in maximum grain (34.2 qlha) and straw yields. Highest water-use efficiency (375 kglha-cm) was recorded with bed planting. A significant positive linear relationship was observed between irrgation depths and root growth and grain yield.
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