EFFECT OF BORON NUTRITION ON PADDY YIELD UNDER SALINESODIC SOILS
Syed Ishtiaq Hyder, Muhammad Arshadullah, Arshad Ali and Imdad Ali Mahmood*
A field experiment was carried out to investigate the -1 effect of different levels of boron (0.5, 1.0, 1.5 and 2.0 kg ha ) on growth, yield and ionic concentration of rice directly sown on raised beds under -1 saline sodic soils (ECe=5.32 dS m , pH=8.52 and SAR=18.87) at Soil Salinity Research Institute, Pindi Bhattian, district Hafizabad, Punjab Pakistan during 2009 and 2010. Treatments were arranged in RCBD with three replications. The crop was harvested at maturity. Data on tillering, -1 plant height, spike length, number of grains spike , 1000-grain weight, straw and paddy yields were recorded. Na, K, Ca and B concentration in grain and straw were estimated using atomic absorption spectroscopy. -1 Tillering, number of grains spike , 1000- grain weight and paddy yield significantly (P≤0.05) increased at different levels of B. 1000-grain weight -1 -1 (31.7 g) and grain yield was the maximum (5.0 t ha ) at 2 kg B ha and 22% more than control treatment. Maximum plant height (155.7 cm) and -1 -1 number of grains spike (125) were recorded with B application @ 1 kg ha . B concentration in grain increased with boron application. Positive correlation (r= 0.94) was found between B contents in grain and paddy grain yield. Economical analysis showed that maximum value cost ratio was -1 (12.5:1) with the application of 1.5 kg B ha .