Varied levels of nitrogen

Maize is one of the most important cereals of the world with its average yield of 27.8 q/ha. Maize ranks first among the cereals and is followed by rice, wheat and millets with average grain yield of 22.5, 16.3 and 6.6 q/ha, in India respectively.

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The ripe fruit contain approximately 79.50 per cent moisture, 15.25 per cent dry matter, 3.20 per cent crude fibre and little amount of ash. The TSS varies from 10.5-14.5 per cent. Several volatile compounds including hydrocarbons, alcohol and carbonyls have been found to be responsible for the characteristic flavor of guava. The decrease in astringency with advancement of maturity is ascribed to polymerization of leuco-anthocyanins.

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Residual effect of fertilizers applied and nitrogen fix by legumes can considerably bring down the production cost, if all the crops are considered when individual crops. In this context, cropping system approaches gaining importance.

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This investigation was designed to study the economic feasibility of use of different varied levels of nitrogenous and potassic fertilizers in eggplant in two new varieties of eggplant.

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The impact of the long–term fertilization alone and in combination with FYM for 30 years was evaluated on microbial and enzymatic activities after rice under a continuing longterm fertility experiment in rice-wheat cropping system initiated in kharif, 1984 at G.B. Pant University of Agriculture and Technology, Pantnagar. The experiment comprised 14 treatments having absolute control, individual N and its combination with P and K at varying levels alone and with FYM.

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A field experiment entitled “Performance of rice varieties at varying levels of nitrogen under direct seeded upland condition” was conducted on silty clay loam soil with low in available nitrogen, medium in phosphorus and high in available potassium at neutral pH Agriculture College Farm, Rewa (M.P.) during Kharif season 2015.

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Considering these factors, the present study was undertaken to evaluate the performance of 2 genotypes under different inter-row spacing and N levels in terms of productivity, economics and changes in soil physicochemical properties over the experimental period.

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Considering these facts, the present study was undertaken to determine the suitable plant density and nitrogen level for optimum growth and improved radiation use efficiency of transplanted rice.

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Study was conducted to evaluate soil fertility status in the four different tasar growing regions in Banka District of Bihar and Dumka District of Jharkhand. A total of 75 surface soil samples (0-30 cm) were collected from the fields of primary tasar food plants (Terminalia arjuna and T. tomentosa) along with the details regarding farmer’s name, land type, fertilizer details, geo location, etc. The collected samples were air dried, sieved and analyzed for various soil fertility parameters such as pH, EC, organic carbon, macro and micro nutrients etc.

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Field experiments were conducted during 2015 & 2016 at Mountain Research Centre for Field Crops, Khudwani, SKUAST-Kashmir, India. Our objective was to measure the impact of alternative water management practices and varying N levels on water productivity, physiology, growth and yield of rice. Treatments comprised of three irrigation regimes; Submerged conditions (I1); Irrigation at 3 days after disappearance of ponded water (I2); Irrigation at 6 days after the disappearance of ponded water (I3) in main plots and four nitrogen doses viz.

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Balanced fertilizer application is important for sustaining the productivity of ramie since the nutrient requirement of the crop is quite high due to its high biomass production. The present experiment was conducted at Nagaon, Assam, India from 2007 to 2009 to study the effect of varying levels of inorganic fertilizer nitrogen alone or in combination with crop residue, i.e., ramie waste on fibre yield and nutrient uptake by ramie, soil fertility and SOC concentration.

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A field experiment was carried out at Agricultural College Farm, Naira, Andhra Pradesh during rabi 2017-18 on sandy loam soils to study the nutrient uptake and grain yield of foxtail millet varieties as influenced by varied levels of nitrogen in rice fallows. The results revealed that nitrogen uptake was highest with the variety SiA 3156 with elevated drymatter production and grain yield at 80 kg N ha-1 and found significantly superior over rest of the varieties and nitrogen levels.

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The present study was conducted to evaluate the response of three castor hybrids (PCH 111, GCH 4, Western Maruthi) to varying nitrogen levels (60, 80, 100 and 120 kg N ha-1 ) under rainfed conditions at Agricultural College Farm, Bapatla during kharif, 2017. The growth characters viz., plant height and dry matter accumulation at harvest, days to maturity and SPAD chlorophyll meter reading as well as yield attributing parameters viz.

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A field experiment was conducted at Regional Research Sub Station (RRSS), New Alluvial Zone, Chakdah, Nadia, West Bengal during boro season (2013-2014) to study the effect of varying levels of nitrogen and planting geometry on high yielding boro rice.

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Spatial distribution of nitrogen, phosphorus and potassium were studied from 99 coconut farmers covering 195 acres representing different irrigation situations in Chikkapattanagere of Chikkamagaluru district, Doddaghatta of Davangere district, Siriyur of Shivamogga district and Madhure of Chitradurga district of Karnataka state, India. The gardens selected were aged 20-25 years with varying management levels.

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Field experiment on “Performance of photo sensitive Rice cv. RNR 15048 (Telangana Sona) under varied nitrogen levels and environmental conditions” was carried out during Kharif 2016 at Agricultural Research Institute, Rajendranagar, Hyderabad. The experiment was laid out in split plot design with five dates of sowing [5 Jun (D1), 20 Jun (D2), 5Jul (D3), 20Jul (D4) and 5 Aug (D5)] as main plots and two nitrogen levels (N1: 120 kg N ha-1 ; N2: 160 kg N ha-1 ) as sub-plots replicated thrice. Flowering duration of rice was influenced by dates of sowing.

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A study was conducted on French bean (Phaseolus vulgaris) at the coastal saline zone of West Bengal during winter 2017-18 and 2018-19. The soil texture was clay loam with pH 7.03. A location specific trial was done to standardize the combination dose for French bean towards productivity enhancement. The experiment was laid out in randomized bock design having 3 replications with 12 different treatments.

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Field experiments were conducted during 2017-18 and 2018-19 in sandy loam soils of Tirupati (AP) to evaluate the direct and residual effect of organic and inorganic sources of nutrients on soil microbial population and yield of cowpea-little millet cropping sequence. Three levels of organic manures (no organic manure, FYM @ 5 tonnes ha-1 and poultry manure @ 2 tonnes ha-1 ) and 3 phosphorus levels (0, 40 and 60 kg P2O5 ha-1 ) applied to preceding cowpea and 3 graded levels of nitrogen viz., 0, 10 and 20 kg ha-1 applied to succeeding rabi little millet.

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A field experiment was conducted on rice during rabi season of 2015 to study the effect of balanced nutrient management in nutrient availability, yield, uptake, protein and oil content in niger. The experiment was conducted using five levels of potassium viz., 0, 20, 40, 60 and 80 kg ha-1 , four levels of sulphur viz., 0, 15, 30 and 45 kg ha-1 , four levels of zinc viz., 0, 2, 4 and 6 kg ha-1 , four levels of Boron viz., 0, 0.5, 1.0 and 1.5 kg ha-1 and nitrogen in a single dose @ 40 kg ha-1 using niger as the test crop.

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A laboratory incubation experiment was carried out to study the N-mineralization and subsequent release of nitrogen from soil, treated with different levels of lime with organic amendments (FYM and enriched compost) over 100 days period. The experiment was laid out in a completely randomized design with 12 treatments replicated thrice. The data were fitted to first-order nitrogen mineralization model since it provided the best fit to the experimental data and also for its simplicity.

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