A field experiment was conducted at Fertilizer Research Station, Uttaripura, Department of Soil Science and Agricultural Chemistry, C. S. Azad University of Agriculture and Technology, Kanpur (U. P.) during kharif 2007. The soil of the experimental field was alluvial in origin. Surface soil samples (0-15 cm) were collected from randomly selected spots in the field before sowing and after harvesting of crop using soil augur and the composite sample was obtained by mixing them thoroughly. Representative samples were dried and made free from foreign materials by passing through 2 mm standard sieve. Some of the physicochemical properties of the experimental soil were : texture loam with sand 50.75%, silt 36.00% and clay 13.25% (Bouyoucos, 1962); pHw (1 : 2, soil : water) 8.25 electrical conductivity (ECw 1 : 2, soil : water) 0.22 dS/m (Jackson, 1973); organic C 0.42 g % (Walkley and Black, 1934); available N 210 kg/ha (Subbiah and Asija, 1956), 0.5 M NaHCO3-extractable P2O5 13 kg/ha (Olsen et al., 1954) and K2O 176 kg/ha (Hanway and Heidel, 1952) and available Zn was 1.12 kg/ha extracted by DTPA. The effectiveness of organic and inorganic fertilizers was evaluated through a field expriment in maize crop following 10 treatments T1 : Control, T2 : N50+P75+K40+Zn5, T3 : N100+P75+K40 +Zn5, T4 : N150+ P75+ K40+Zn5, T5 : T2+Azotobacter, T6 : T3+ Azotobacter, T7 : T4+Azotobacter, T8 : FYM @ 5 t/ha+ T2+Azotobacter, T9 : FYM @ 5 t/ha+T3+Azotobacter and T10 : FYM @ 5 t/ha+T4+Azotobacter. FYM used in the experiment contained 0.55% N, 0.2% P, 0.46% K, C : N 78, pHw (1 : 5) 7.8 and ECw (dS/m) 0.22. The experiment was laid out in a randomized block design with four replications with standard recommended practices, plot size of 10 x 5 m. Maize (Zea mays L.) variety Proagro - 4212 was grown. The seed inoculation was done by mixing the seed with the slurry of carrier based inoculums of Azotobacter culture (108 cell/g) in 10% aqueous sugar solution (boiled and cooled). The inoculated seeds were dried and sown in the afternoonon the same day. Well decomposed farm yard manure was applied in the field 10 days before sowing of the crop. Half of the nitrogen and full of phosphorus, potash and zinc were applied as a basal dose in the form of urea, DAP, MOP and zinc sulphate, respectively. Remaining nitrogen was applied in two splits at tasseling and silking stages. Sowing of maize was done in 50 x 25 cm spacing. Biometric observations such as average plant height at maturity, grain weight per cob and test weight of grains in gram were recorded treatment-wise. Grain and straw yields were recorded per plot and converted into Mg/ha. Data generated from the field experiments were subjected to the statistical analyses of variance appropriate to the experimental design. Data were assessed by Duncan’s multiple range tests (Duncan, 1955) with a probability P<0.05. Least significant difference (LSD) between means was calculated using the SPSS program (SPSS version 16.0). Pearson’s correlation matrix for yield, plant height, cob length, test weight and uptake of nutrients in soils was also computed by the SPSS 16.
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