Abstract :
The yield of wheat ranged from 29.16 to 45.14 and 29.56 to 49.14 q ha-1 during 2005-06 and 2006-07, respectively was influenced significantly by different treatments. During 2005-06 maximum grain yield (45.14 q ha-1) was recorded in case of treatment T10 (3 tonnes vermicompost + 100% NPK of RDF), where 100% NPK with vermicompost @ 3.0 t ha-1 was applied, was found statistically at par with treatment T7 (3 tonnes vermicompost +75% NPK of RDF), where vermicompost @ 3.0 t ha-1 was applied with 75% NPK and significantly higher than the rest of the treatment. Similar trend of treatments effect on grain yield was also obtained during second year i.e. 2006-07. With exception of T2 (one tonne vermicompost + 50% NPK of RDF), grain yield recorded in T1 (150: 60: 40: as NPK, recommended dose of fertilizers), where 100% NPK was supplemented through inorganic source was found significantly lower than the rest of the treatments. Graded does of vermicompost with similar does of NPK influenced the grain yield of wheat significantly during both the years with exception of T8 (one tonnes vermicompost +100% NPK of RDF) and T9 (two tonnes vermicompost + 100% NPK of RDF). Results revealed that 50% NPK can be substituted by the application of @1.0 t ha-1 vermicompost as the grain yield recorded in T1 (150: 60: 40: as NPK, recommended dose of fertilizers) and T2 (one tonne vermicompost + 50% NPK of RDF), was statistically similar while grain yield increased significantly due to application of vermicompost @ 2.0 t ha-1 with 50% NPK. Application of different does of vermicompost with 75% NPK yielded significantly higher than the T1 (150: 60: 40: as NPK, recommended dose of fertilizers), where only 100% NPK was applied during both the years. No significantly variation in grain yield of wheat was found between the treatments having application of 1 t ha-1 vermicompost with either 50% or 75% NPK but yield varied significantly between treatments having the application of 1 t ha-1 vermicompost with 50% or 100% NPK. Similarly no variation was also found between T3 (two tonne vermicompost + 50% NPK of RDF) and T6 (two tonne vermicompost + 75% NPK of RDF) and T4 (three tonne vermicompost + 50% NPK of RDF) and T7 (three tonnes vermicompost +75% NPK of RDF), while T4 (three tonne vermicompost + 50% NPK of RDF) and T10 (three tonnes vermicompost + 100% NPK of RDF), varied significantly during both the years. This implies that application of 3.0 t ha-1 of vermicompost along with 75% NPK is a better combination for optimum crop yield. This combination also enhanced the physical, chemical properties of soil by improving the availability of different nutrients.
Keyword :
Earthworms, vermicompost, chemical fertilizers, soil fertility, plant productivity