Influence of different seeding rates on growth and grain yield of two varieties of wheat

An experiment was conducted to assess the effect of seeding rates in the growth and yield of two wheat varieties at Agronomy Experimental fields, Agriculture Research Institute, Tandojam during winter, 1998-99. Two wheat varieties (TJ-83 and Anmol) were planted under various seeding rates (75, 100, 125, 150 and 175 kg/ha) in a four replicated randomized complete block design (factorial). A 2*3 meter plot area was maintained. Observation were recorded on grain yield and its related characters were subjected to analysis of variance, to discriminate the superiority of mean values LSD test was applied. Plant height varied significantly (P less than 0.01) due to change in varieties and seed rates. While their interaction was non-significant. Individually taller plants (97.07) were observed in case of variety Anmol and seed rate 175 kg/ha. A highly significant differences in number of tillers/plant were found between varieties and seeding rates while their interaction was non- significant. Individually greater number of tillers 11.44, 13.37 and 14.35 plant were found incase of variety TJ-83, 75 kg/ha of seed rate and their interaction (75 kg/ha seed rate variety TJ-83). Number of spikelets/spike differed significantly (P0.01) due to varieties, seeding rates and their interaction (V * R). Variety TJ-83 with 75 kg/ha of seed rate displayed greater number of spikelets. A highly significant differences in spike length between varieties seeding rates and their interaction (V*R) was observed. Individually TJ-83, 75 kg/ha seed rate and their interaction recorded longer spikes 11.63, 12.88 and 13.75 cm respectively. Number of grains/spike affected significantly by the varieties and seeding rates, while their interaction was non-significant. Greater number of grains 58.31, 61.98 and 64.45/spike were recorded incase of variety TJ-83, 75 kg/ha of seed rate and their interaction (TJ- 83 * 75 kg/ha seed rate). Seed weight/spike varied significantly over varieties, seeding rates and their interactions (V * R). Individually variety TJ-83. 75 or 100 kg/ha seed rate and the interaction between TJ-83 x 75 kg/ha seed rate displayed greater grain weight (15.65. 17.33 or 16.65 and 18.75 g/plant): Seed index values was changed significantly due to different varieties and seeding rates; while their interaction was non-significant. Greater seed index values (32.004, 36.23 and 38.45, g) were found incase of variety TJ-83. 75 kg/ha seed rate and their interaction (TJ-83 * 75 kg/ha seed rate) respectively. A highly significant difference in grain yield over varieties, seeding rates and their interaction was found. Individually greater grain yields 3740, 4110 and 4320 kg/ha were recorded incase of variety TJ-83, 175 kg/ha of seed rate and the interaction between TJ-83 x 175 kg/ha of seed rate respectively.