A field investigation was conducted during the kharif season of 2014 to optimize N doses and planting densities for enhanced growth and yield performance of maize under rainfed conditions of Nagaland. Application of N @ 80 kg/ha resulted in higher N uptake and enhanced growth of maize ultimately expressing superior yield attributes and registering the highest grain and stover yields of 3518.5 and 6976.01 kg/ha respectively. Maintaining a planting density of 55,555 plants/ha at a spacing of 60 cm x 30 cm was found to provide optimum crop stand in maize resulting in higher N uptake and favourable growth consequently recording better yield attributes and maximum grain yield of 2941.66 kg/ha. However, higher planting density of 74,074 plants/ha at a spacing of 45 cm x 30 cm was found to be more effective for higher stover yields up to 6772.63 kg/ha.
A field experiment was conducted during the kharif season of 2012 to study the response of black gram [Vigna mungo (L.) Hepper] to different spacing and fertilizer doses under rainfed conditions. Maintaining a wider spacing of 30×10 cm (S 2 ) was found to increase uptake of nutrients P and K by the crop resulting in significantly higher number of leaves, branches and pods per plant respectively, thereby registering the highest grain and stover yields of 730 kg/ha and 1382 kg/ha respectively. Among the fertilizer dose, F 2 (N 10 P 40 K 20 + FYM@ 5 t/ha) was found to increase the availability of NPK by the crop resulting in significantly superior growth attributes viz., plant height, number of leaves and branches/plant and leaf area index (LAI) ultimately recording maximum number of pods/plant, test weight and grain yield of 725 kg/ha. Whereas, the fertilizer dose F 3 (N 20 P 50 K 30 ) was found to record the highest stover yield of 1362 kg/ha.
Field investigations were conducted during 2015 and 2016 kharif seasons at the experimental farm of ICAR, Nagaland Centre, Medziphema to study weed growth and nutrient uptake in organically managed rice and maize as affected by N management and live mulching with cowpea. The experiment was laid out in factorial RBD with two kharif crops viz., rice (C1) and maize (C2), two organic N management viz., vermicompost @ 2 t/ha (N1) and vermicompost @ 2.7 t/ha (N2) and two mulches viz., control (No mulching) (L1) and live mulching with cowpea (L2). The dominant weed species observed were Cynodon dactylon, Digitaria setigera, Ageratum conyzoides, Amaranthus viridis, Cyperus iria and Cyperus rotundus. Weed density, dry weight and NPK uptake was found to be significantly lower in maize compared to rice during both years. Weed growth and NPK uptake was also found to be significantly higher with application of vermicompost @ 2.7 t/ha (N2) compared to 2 t/ha (N1) whereas, significantly lower weed growth as well as NPK uptake was also recorded with cowpea live mulch (L2) as compared to no mulching (L1). Cowpea live mulch (L2) with application of vermicompost @ 2 t/ha (N1) was found to record significantly lower NPK uptake by weeds in both crops. Yield and yield attributes of rice and maize were observed to be higher under cowpea live mulch with application of vermicompost @ 2.7 t/ha (N2).
The present investigation was conducted to study the growth and yield response of local rice cultivars to application of recommended dose of NPK fertilizers under upland rainfed conditions. It was found that the application of recommended NPK fertilizer dose (60:30:30 kg/ha) resulted in significantly superior expression of rice growth and yield attributes by the different cultivars recording increased grain yields up to 36.51 q/ha and straw yields of 60.96 q/ha. Among the 8 local rice cultivars tested signification variations in plant growth, yield and yield attributes were observed. The cultivar 'Muntse' was found to be the most adaptable rice variety recording the highest grain yield of 42.94 q/ha followed by 'Temeseng', 'Leikhumo' and 'Chongloi Mann'. Application of recommended fertilizer dose (60:30:30 kg/ha) to the cultivar 'Mumtse' was found to record the highest gross return/ha (Rs.51,342), net return/ha (Rs. 30,169) as well as BCR (1.42) compared to the rest of the treatments tested.
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