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Subject: Agronomy × Author: Bezboruah, Minakshi × End date: 2020 × Start date: 2020 ×
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    ThesisItemOpen Access
    INTEGRATED NUTRIENT MANAGEMENT IN SUMMER MAIZE (Zea mays)
    (AAU, Jorhat, 2020-11) Bezboruah, Minakshi; Dutta, Rinjumoni
    A field experiment entitled “Integrated nutrient management in summer maize (Zea mays)” was carried out at Instructional-cum- Research (ICR) Farm, Assam Agricultural University, Jorhat during the year 2019 to find out the effect of INM practice to the growth and yield of summer maize and to study the post-harvest nutrient status of soil as affected by different INM practices. The experiment was laid out in randomized block design with nine treatments and replicated thrice. The treatments consisted of both soil and foliar application of fertilizers viz., T1 [60-40-40 kg/ha NPK (RDF)], T2 [RDF + Azospirillum + PSB], T3 [RDF + Azospirillum + PSB + 2 sprays of vermiwash at 25 & 40 DAS], T4 [75% N of RDF + 25% of N replaced by vermicompost], T5 [75% N of RDF + 25%of N replaced by vermicompost + Azospirillum + PSB], T6 [75% N of RDF + 25% of N replaced by vermicompost + Azospirillum + PSB + 2 sprays of vermiwash at 25&40 DAS], T7 [50% N of RDF+ 50% of N replaced by vermicompost], T8 [50% N of + 50% of N replaced by vermicompost + Azospirillum + PSB], T9 [50% N of RDF + 50% of N replaced by vermicompost + Azospirillum + PSB + 2 sprays of vermiwash at 25&40 DAS]. The soil of the experimental site was sandy loam in texture, acidic in reaction, medium in organic carbon (0.72%), low in available N (156.19 kg/ha) and medium in available P2O5 (23.78 kg/ha), and K2O (161.50 kg/ha). N was applied in two split doses one at knee high stage and second application was before tasseling. The maize seeds of the variety VMH-53 was sown on 15th of March (2019) and harvested by two picking on 10th June and 15th June. Experimental findings revealed that INM practices influenced both the growth and yield attributing characters. Application of RDF + Azospirillum + PSB + 2 sprays of vermiwash at 25 & 40 DAS (T3) recorded highest values for all the growth attributing parameters. Similarly, the yield attributing characters like weight of cob with and without husk, length of cob, number of rows per cob, grain per row, grain per cob, weight of grain per cob and nutrient (NPK) uptake was observed to be highest under RDF + Azospirillum + PSB + 2 sprays of vermiwash at 25 & 40 DAS (T3) which was at par with 75% N of RDF+ 25% of N replaced by vermicompost + Azospirillum + PSB + 2 sprays of vermiwash at 25&40 DAS. Likewise, the highest grain and stover yield being 43.04 q/ha and 89.66 q/ha respectively was produced from RDF + Azospirillum + PSB + 2 sprays of vermiwash at 25 & 40 DAS (T3) which was at par with the grain 6 yield 41.81 q/ha and stover yield 87.42 q/ha obtained from 75% N of RDF+ 25% of N replaced by vermicompost + Azospirillum + PSB + 2 sprays of vermiwash at 25&40 DAS (T6). However, the protein content in maize and nutrient content in soil after harvest was found to be non-significant. In terms of economics, the highest gross return (` 96765), net return (` 77705) and the B:C ratio (4.08) was recorded from the treatment RDF + Azospirillum + PSB + 2 sprays of vermiwash at 25 & 40 DAS (T3)and which was nearly followed by the treatment75% N of RDF + 25% of N replaced by vermicompost + Azospirillum + PSB + 2 sprays of vermiwash at 25 & 40 DAS (T6).