| Genotypic differences were found highly significant for all the three
characters studied in the present study (grain yield, biological yield and
harvest index) indicating, thereby, that sufficient genotypic variability
existed in the material. Based on the results of three years on grain yield,
15 varieties have been identified which yielded consistantly good. Their
data are presented in Table 1. These varieties
appeared to be the most drought tolerant or can give good yields under drought/rainfed
conditions particularly South-Western part of Haryana State. Many of these
varieties have been recommended for commercial cultivation under drought/rainfed
condtions in various states in India like, C306, NI 5439, Narbada 4, WL
410 etc. and also have been identified better under drought by Chowdhury
and coworkers while studying 60 wheat genotypes under six varying levels
of irrigations under Bawal conditions. Chowdhury et al (1985) reported C306,
Narbada 112, N 7231 and HI 617 as the outstanding varieties under zero irrigation.
While studying stability parameters, Chowdhury et al (1985) identified varieties
Narbada 112 and N 7231 suitable for poor environment. Variety C306 appeared
to be the stable over wide range of environments. Chowdhury et al (1986)
also reported low/moderate drought susceptibility indices (s) for some of
these varieties. Those having s below 0.7 as least drought susceptible or
most drought tolerant ones were NI 5749, HS82, MP 823 A and HD 2037 while
moderately drought tolerant i.e. having s value between 0.7 to 1.0 were
NI 5439, K7527, HP1258, N7231, Narbada112 and MP195. Based on drought susceptibility
index and productivity under drought environment, varieties Narbada 4, and
HS 82 were found to be best for drought conditions. There were varieties
ike C306, Narbada112, N7231. HI 617 and Nl 5749, which has s value on higher
side, but gave higher yields under drought conditions and this were best
for drought environment. The drought susceptibility index of variety C306
was also reported between 0.91 to 1.08 by Fischer and Maurer (1978). The results of the present study also showed that the grain yield was contributed mainly by the total biological yield in most of the varieties. Chowdhury et al (1985) also reported that grain yield was mainly contributed by total biological yield. The correlation studies also showed +ve correlation of grain yield with plant height, total biological yield and harvest index. References Chowdhury RK, Arya AS and Paroda RS (1985) Drought resistance in Wheat. III Grain yield responses. Proc 3rd Nat Sem Genet Wheat Improv 8 - 10 May, 1985, Shimla, India. Chowdhury RK, Paroda RS and Singh BP (1985) Drought resistance in Wheat. I Grain yield responses and its correlation with grain yield components. Genetica Agr 39: 131-42. Chowdhury RK, Arya AS and Paroda RS (1986) Drought resistance in bread wheat. Int Wheat Conf 2-8 May, 1986, Morroco, Rabaot (Accepted). Submitted. Fischer KS, Johnson EC and Edmeads HO (1982) Breeding and selection for drought resistance in tropical maize. In 'Drought resistance in crops with emphasis on rice', pp 337-400 (IRRI: Los Banos, Philippines). Fischer RA and Maurer R (1978) Drought resistance in spring wheat cultivars. Grain yield response. Anst J Agric Res, 29: 897-912. |
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