PJB-2010-331
ONTOGENY GROWTH AND RADIATION USE EFFICIENCY OF HELIANTHUS ANNUUS L., AS AFFECTED BY HYBRIDS, NITROGENOUS REGIMES AND PLANTING GEOMETRY UNDER IRRIGATED ARID CONDITIONS
A. ZAHOOR1, M. RIAZ1, S. AHMAD1*, H. ALI1, M.B. KHAN1, K. JAVED1, M.A. ANJUM2, M. ZIA-UL-HAQ3 AND M.A. KHAN4
Abstract
Response of sunflower (Helianthus annuus L.) hybrids in terms of ontogeny growth and radiation use efficiency (RUE) to nitrogenous regimes and planting geometries was studied in two field experiments conducted at Experimental Farm, Bahauddin Zakariya University (BZU), Multan, Pakistan during spring 2009. Variables included in this study were four hybrids and four nitrogenous regimes in experiment 1; three hybrids and three planting geometries in experiment 2. Overall, increasing nitrogenous regimes significantly increased LAI compared to control in experiment 1, while, in experiment 2, the ridge and bed sown crops yielded higher LAI as compared to the flat sown crop. The accumulative leaf, root, stem, head and total dry matter were 63, 51
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