Impact of organic and nano urea scheduling on multi cut oat (Avena sativa L.)
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Date
2022-08
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G. B. Pant University of Agriculture and Technology, Pantnagar
Abstract
Field experiment was conducted during Rabi season - 2021-22 at Instructional Dairy Farm (IDF), Nagla, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) to study the “Impact of organic and nano urea scheduling on multi cut oat (Avena sativa L.). The soil of the experimental site was silty clay loam in texture with nearly neutral pH (6.70), rich in organic carbon (0.75%), low in available nitrogen (200.40 kg ha-1), medium in available phosphorus (19.40 kg ha-1) and available potassium (226.80 kg ha-1). The experiment consists of 12 treatments i.e., T1-125% RDN, T2-125% RDN (basal) +NU, T3-100% RDN, T4-100% RDN (basal) + NU, T5-75% RDN (basal) + NU, T6-50% RDN (basal) + NU, T7-100% RDN VC, T8-75% RDN VC + NU, T9-50% RDN VC + NU, T10-NU 25DAS + 1st and 2nd cut, T11- NU 20, 40 DAS + 1st and 2nd cut and T12-control, was laid out in Randomized Block Design (RBD) with three replications. The oat variety “Pant Oat-3” was sown on 15th November, 2021 and harvested on 30th March, 2022. The growth and yield attributes, green fodder yield, dry fodder yield, crude protein content, economics, N, P, K uptake and soil residual fertility were significantly influenced by different organic and nano urea scheduling. The highest green fodder yield was recorded under 125% RDN which was 6.9, 6.6 and 10.3% higher than 125% RDN (basal) +NU, 100% RDN and 100% RDN (basal) +NU respectively, however they were statistically at par with each other. Among the treatments using vermicompost alone or integrated with nano urea, 75% RDN VC+NU recorded 3.1 and 3.3% higher green fodder yield than 100% RDN VC and 50% RDN VC+NU, respectively. Treatments NU 25 DAS+ 1st & 2nd cut and NU 20 & 40DAS + 1st & 2nd cut produced nearly 17% higher green fodder yield than control. The NPK content, its uptake and protein content were also recorded significantly higher with application of 125% RDN that was non-significant with 125% RDN (basal) +NU, 100% RDN and 100% RDN (basal) +NU. The apparent nutrient balance was also found higher under above treatments than alone application of nano urea. Similarly, application of 125% RDN also gave significantly highest gross return, net return and B:C ratio but it was statistically at par with 100% RDN. The experimental results indicated that higher fodder yield, economics and apparent nutrient balance of multi cut fodder oat can be achieved with the application of 100% RDN i.e., 120:60: 40::N: P2O5:K2O kg ha-1. In addition, the combined application of vermicompost @4.5t ha-1 at basal followed by two sprays of nano urea @4ml l-1 at first and second cut can also be preferred for better yield and quality with least chemical residues as well as higher sustainability in Tarai region of western Himalayas.