RICE PRODUCTIVITY AND SOIL HEALTH AS AFFECTED BY WHEAT RESIDUE INCORPORATION ALONG WITH NITROGEN STARTER DOSE UNDER SALT-AFFECTED SOIL
Arshad Ali, Muhammad Arshadullah, Syed Ishtiaq Hyder, Imdad Ali Mahmood and Badar-uz-Zaman*
A field experiment was conducted to determine the effect -1 of wheat straw incorporation @ 5 t ha along with different N starter doses -1 (0, 30, 60 and 90 kg N ha ) on rice (Supper basmati) production and soil health at MK Farm, Farooqabad, district Sheikhupura under saline sodic -1 soil (ECe=5.65 dS m , pH=8.57and SAR=19.38) during 2010. Treatments were arranged in RCBD with three replications. The crop was harvested at maturity, data on tillering, plant height, spike length, number of grains -1 spike , 1000-grain weight, straw and paddy yields were recorded. Plant samples collected at maturity were analyzed for K, Ca and Na -1 concentration in grain and straw. Tillering, grains spike , 1000-grain weight and paddy yield significantly (P≤ 0.05) increased with different -1 levels of N doses. Maximum tillers plant (27.66), plant height (138.33 cm), -1 spike length (28.33 cm), and grains spike (175), 1000-grain weight (28.66 -1 -1 g) and paddy yield (4.25 t ha ) was harvested with 5 t ha wheat straw -1 incorporation plus 60 kg N ha . The paddy yield was 19% more than control 2+ + treatment. Positive correlations (r= 0.74) and (r=0.73) between Ca and K contents in grain and its yield were calculated. However negative + correlation (-0.85) between Na content in grain and paddy yield was 2+ + noticed. Data indicates presence of significantly higher Ca and K contents in grain receiving wheat straw incorporation along with N starter -1 dose (30 kg ha ). Economical analysis showed that maximum value cost -1 ratio (4.1:1) was determined with incorporation of 5 t ha wheat straw plus -1 60 kg N ha .