Assessment of water requirement of tobacco at Rajamundry (Andhra Pradesh)

lkj & bl 'kks/k i= esa jkt eWqnjh esa 1979 ls 1988 esa jch ds ekSle ds nkSjku cksbZ xbZ rackdw dh fdLeksa ds fy, ty mi;ksx) ty mi;ksx {kerk ¼MCY;w- ;w- bZ-½ vkSj ty vko';drk larqf"V lwpdkad ¼MCY;w- vkj- ,l- vkbZ-½ dk v/;;u fd;k x;k gSA rackdw dh Qly o"kkZ ty dh jkf'k) ty mi;ksx vkSj ty vko;';drk larqf"V lwpdkad ls jSf(kd vkSj fo'ks"k :i ls ijLij laca) gksrh gSA cqvkbZ ds le; o"kkZ dh dqy ty jkf'k Qly ds fy, ty dh vko';drk dks iwjk djus esa vi;kZIr gksrh gS vkSj bl deh dh iwfrZ blls igys dh (kjhQ ds ekSle ls laxzfgr dh xbZ enk dh ueh ls vkaf'kd :i ls dh xbZ gSA rackdw dh Qly ds idus dh voLFkk esa o"kkZ dh vf/kdrk iRrksa dh mit vkSj xq.koRrk dks izfrdwy :i ls izHkkfor djrh gSA Qly dh lh- Vh- vkj- vkbZ- Lis'ky fdLe ds fy, 110-0 ls 186-6 fe- eh- vkSj t;Jh ds fy, 86-8 ls 184-0 fe- eh- ty dh jkf'k dh (kir vyxvksx {kerk lh- Vh- vkj- vkbZ- Lis'ky vkSj t;Jh ds fy, Oe'k% 6-1 vkSj 6-4 fd-xzk-@gS-@fe- eh- ikbZ xbZ gSA Qly c<+okj dh voLFkk esa ty dh vf/kdre jkf'k 81-2 fe- eh- (kir gqbZ ¼vFkkZr 58-7 izfr'kr½ blds ckn Qly ds rS;kj gksus ds le; 36-5 fe- eh- ¼26-5 izfr'kr½ vkSj Qly ds vafre :i ls id dj rS;kj gksus ds nkSjku ¼14-8 izfr'kr½ vis{kkdr de ¼20-6 fe- eh-½ jghA Qly ds idus dh vkf(kjh voLFkk esa vkSlr Kc eku vf/kdre ¼0-5½ FkkA ty dh vko';drk larqf"V lwpdkad ls Qly dh cqvkbZ ls idus ds nkSjku ds VsaUM esa deh dk irk pyrk gS vkSj Qly ds idus ds vkf(kjh nkSj esa ty dh vko';drk cgqr vkf/kd gksrh gS vkSj o"kkZ ds de gksus dh otg ls gzkl nj c<+ tkrh gSA ABSTRACT. Water use, Water Use Efficiency (WUE) and Water Requirement Satisfaction Index (WRSI) of tobacco varieties grown during rabi 1979 to 1988 at Rajamundry had been studied. The yield of tobacco was linearly and significantly correlated with amount of rainfall, water use and WRSI. The total amount of rainfall during growing season was inadequate to meet the crop water requirements and these were partially met from stored soil moisture from previous kharif season. The excess rain during ripening stage of tobacco adversely affected the leaf yield and quality. The amount of water consumed varied between 110.0 to 186.6 mm for CTRI Special, 86.8 to 184.0 mm for Jayashri. The mean WUE was found to be 6.1 and 6.4 kg/ha/mm respectively for CTRI Special and Jayashri. The maximum amount of water consumed was 81.2 mm (i.e., 58.7%) during grand growth stage, followed by 36.5 mm (26.5%) during establishment stage and comparatively less (20.6mm) during maturity stage (14.8%). The average Kc value was maximum (0.5) during grand growth stage. WRSI showed decreasing trend from sowing towards maturity and the rate of decrease was high in grand growth stage due to peak water consumption and less rainfall.