Reprint - Central Arid Zone Research Institute

the other three methods can be converted into modified. Penmanvalues with the ratios worked out.48 Sahu, D.D. and Sastry, P.S.N. (1992)Crop water deficit index at phenophases and yield of kharif crops inGujarat. Annals of Arid Zone. 31: 277-280Aridity index is derived in relation with individual phases of kharifcrops and designated as crop water deficit index (CWDI). Weeklyindices were cumulated from sowing to maturity to get seasonalCWDI. Yield and phenophasic CWDI were found to be negativelycorrelated while the CWDI during flowering and grain filling stagesof crops were significantly correlated with yield. The impact ofseasonal and phenophasic crop water deficit is reflected in the cropproductivity and its variability at different stations in Gujarat.49 Sarma, A.A.L.N. (1977)Variability of droughtiness in the climatic spectrum of the southIndian region. Annals of Arid Zone. 16: 395-400The paper is concerned with the decadal droughtiness variation. Thearidity index of Thornthwaite (1948) has been used as the centralparameter for assessing the droughtiness of a station. Decadalvariations in droughtiness were computed and the mean values of itat a station for a climatic type were graphically plotted.50 Saseendran, S.A., Rathore, L.S. and Datta, R.K. (1996 )Distribution of monsoon rainfall in India during El Nino associateddrought situations. Annals of Arid Zone. 35: 9-16The temporal and spatial variability of south west monsoon rainfallin India during years of (I) drought associated with El Nino, (ii)drought not associated with El Nino, and (iii) nondrought associatedwith El Nino during 1901-1990 were studied. The study revealedthat August is the most dependable month for rainfall duringdrought years associated with El Nino. During drought notassociated with El Nino, for most of the sub-divisions, June is themost dependable month. During nondrought years, associated withEl Nino, the monsoon was found to start sluggishly in June, butsubsequently it picked up, in amount of rainfall during July andAugust. Most of the sub-divisions received normal or excess rainfallduring these months. Rainfall scenario at individual sub-divisionscan be derived from the results.51 Sastri, A.S.R.A.S. and Malakar, A.R. (1981)Climatological analysis of drought over north-west India during theyear 1979. Mausam. 32: 259-262