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  1. Effect of Weed Management Practices on Nutrient Uptake by Direct Seeded Upland Rice under Tripura Condition

    Effect of Weed Management Practices on Nutrient Uptake by Direct Seeded Upland Rice under Tripura Condition Chakraborti, M.; Duary, B.; Datta, M. Field experiment was conducted during the kharif season of 2013 and 2014 to study the effect of weed management practices on nutrient uptake by direct seeded upland rice. The experiment consisted of twelve treatments laid out in randomized complete block design with three replication. The common weed flora found in the experimental field were Amaranthus viridis, Oldenlendia corymbosa, Spilanthes acmella, Ludwigia parviflora, Cleome rutidosperma, Malvestrum coromondalianeum among the broad leaf weed, Digitaria sanguinalis among grasses and Cyperus iria among sedges. The highest uptake of NPK was recorded by the treatment hand weeding thrice at 15, 30 and 45 DAS, while weedy check registered the lowest uptake values for all the major nutrients. Among the other treatments, pendimethalin at 1.0 kg ha-1 + one hand weeding at 30 DAS and pendimethalin at 1.0 kg ha-1 at 2 DAS + bispyribac sodium at 25 g ha-1 at 20 DAS were found more efficient with respect to nutrient uptake.
  2. Effect of weed management practices on yield and yield attributes of wet direct seeded rice under lowland ecosystem of Assam

    Effect of weed management practices on yield and yield attributes of wet direct seeded rice under lowland ecosystem of Assam Satapathy1, BS; Duary, B; Saha, S; Pun, KB Field experiment was conducted at Agricultural Farm of the Regional Rainfed Lowland Rice Research Institute, Gerua, Assam during early ahu (summer) season of 2015 and 2016 to study the influence of different weed management practices on yield and yield attributes of wet direct seeded rice sown through drum seeder. The dominant weed flora in the experimental field consisted of sedges Cyperus difformis L., Scirpus incurvatus Roxb., grasses Leptochloa chinensis L., Echinochloa glabrescens, Echinochloa colona L. and broad-leaved weed Ludwigia adscendes L. The composition of grasses, sedges and broad-leaved weeds in weedy check plot at 60 DAS was 15.1, 71.5 and 13.4%, respectively. There was 37.3% reduction in the grain yield of rice due to competition with weeds in the weedy plots. All the weed control treatments significantly reduced weed population, dry matter and increased grain yield of rice compared to weedy check. Hand weeding twice recorded grain yield of 5.64 t ha-1 resulting in 54.5% increase over weedy check. Mechanical weeding followed by one hand weeding recorded reduction in grain yield of 9.2% over hand weeding twice. Application of flucetosulfuron at 25 g ha-1 (5.42 t ha-1), bispyribac sodium at 30 g ha-1 (5.40 t ha-1), azimsulfuron at 35 g ha-1(5.38 t ha-1) and bensulfuron methyl+pretilachlor at 60+600 g ha-1 recorded grain yield on par with the hand weeding twice. Tank mix application of azimsulfuron+bispyribac sodium recorded 2.2% and 1.9% only, increase in grain yield over its single application.
  3. Soil Carbon Sequestration and Crop Yields in Rice–Wheat and Sugarcane–Ratoon–Wheat Cropping Systems Through Crop Residue Management and Inoculation of Trichoderma viride in Subtropical India

    Soil Carbon Sequestration and Crop Yields in Rice–Wheat and Sugarcane–Ratoon–Wheat Cropping Systems Through Crop Residue Management and Inoculation of Trichoderma viride in Subtropical India Shukla, S. K.; Shee, Swaha; . Maity, S. K; Solomon, S. A field experiment was conducted at ICARIISR, Lucknow, in a split-plot design with two cropping systems and eight different crop residue management practices. In main plots, cropping systems, viz. CS1—rice– wheat (R–W) and CS2—sugarcane (plant crop)–ratoon– wheat (S–R–W) and subplots residue management practices, viz. residue removal (T1-RR); residue burning (T2- RB); residue incorporation (T3-RI); residue incorporation ? Trichoderma (T4-RI ? T), residue incorporation ?25 % extra nitrogen application (T5-RI ? N), partial residue incorporation (T6-PRI), partial residue incorporation ? Trichoderma (T7-PRI ? T) and partial residue incorporation ?25 % extra nitrogen application (T8- PRI ? N), were allocated. The observations on soil physical parameters indicated the lower mean bulk density (1.10 Mg m-3) in sugarcane–ratoon–wheat system than the rice–wheat system (1.145 Mg m-3). Increased porosity (58.68 %) was obtained in sugarcane–ratoon–wheat (S–R– W) system as compared to rice–wheat system (56.83 %). In S–R–W system, higher (19.51 %) SOC was recorded than the R–W system (16.31 Mg ha-1) at 0–15 cm depth. After harvesting of wheat in both the cropping systems, higher total carbon sequestered (@1.42 Mg ha-1) in S–R–W system than the R–W cropping system (0–15 cm soil depth). Higher contents of available nitrogen, phosphorous and potassium were recorded in S–R–W system than the R–W system after completion of crop cycle. The agronomic efficiency of rice, wheat and sugarcane crops indicated the higher level with residue incorporation along with Trichoderma application. Thus, it could be concluded that sugarcane–ratoon–wheat system acted as soil fertility restorer and crop reside management along with application of Trichoderma sustained the soil carbon level, crop productivity and agronomic/production efficiency of N for longer period.
  4. Energetic Evaluation of Integrated Nutrient Management for Nitrogen in Kharif Rice and its Residual Effect on Yellow Sarson

    Energetic Evaluation of Integrated Nutrient Management for Nitrogen in Kharif Rice and its Residual Effect on Yellow Sarson Mallikarjun, M; Maity, S K The field experiment was conducted during kharif and rabi seasons of 2015-16 and 2016-17 to study energetics of integrated nutrient management (INM) practices in rice and subsequent Yellow Sarson grown under residual nitrogen (N) in soil. Different energetic parameters were estimated individually for rice, Yellow Sarson and over the rice-Yellow Sarson together. The experiment was laid out in randomized block design with eight treatments including six INM practices, one chemical practice and one control (i.e. no N) with three replications. The results revealed that INM practices involving 25% replacement of N through green manuring or brown manuring with dhaincha and 50% replacement of N through organics (FYM and Azolla dual cropping) came out to be best in terms of energy indices like energy output, energy productivity and energy ratio. The practice of 75% N as chemical fertilizer with dhaincha brown manuring recorded the highest energy output (218.7MJ × 103), energy productivity (209.7 Kg MJ-1 × 103) and energy ratio (14.81).
   
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