Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810102692
Authors: SRUTHI, N
Advisor: BALAGURAVAIAH, D
Title: EVALUATING SITE SPECIFIC AND REAL TIME NITROGEN MANAGEMENT STRATEGIES FOR HYBRID MAIZE (Zea mays L.)
Publisher: Acharya N.G. Ranga Agricultural University
Language: en_US
Type: Thesis
Pages: 145
Agrotags: null
Keywords: EVALUATING SITE SPECIFIC, REAL TIME, NITROGEN, MANAGEMENT STRATEGIES, MAIZE, Zea mays L.
Abstract: A field experiment was conducted during kharif season, 2017 on sandy loam soils of Agriculture College Farm, Mahanandi, Acharya N.G. Ranga Agricultural University, Andhra Pradesh entitled “Evaluating Site Specific and Real Time Nitrogen Management Strategies for Hybrid Maize (Zea mays L.)”. The investigation was carried out to study, evaluate and identify suitable site specific and real time nitrogen management options so as to synchronize N application with that of crop N demand for achieving higher yield and N use efficiency in hybrid maize. The experiment was conducted in randomized block design with eight treatments replicated thrice. The treatments include recommended fertilizer dose (T1), soil test based fertilizer application (T2), LCC based approach i.e., apply N25 if LCC value < 5 (T3), SPAD chlorophyll meter based approach i.e., apply N25 if SPAD value < 50 (T4) and Green Seeker based approach i.e., based on NDVI (T5), Farmer Fertilizer Practice (T6), STCR based targeted approach with a target yield of 8 t ha-1 approach (T7) and Absolute Control (T8). xvii The experimental field was slightly alkaline in reaction, non saline in nature and low in organic carbon, low in available nitrogen, low in available phosphorus and high in potassium. The N received by the crop under different treatments ranged from 180 to 320 kg ha-1 in 3 to 5 splits based on the treatment demand. With varying nitrogen levels in different treatments, performance was evaluated in terms of maize grain yield, nutrient uptake, N use efficiency and B:C ratio. Leaf samples were analyzed for nutrient composition (N, P, K and micronutrients) at every 10 days intervals up to tasseling stage, grain and stover yield at harvest and nutrient uptake was computed. Absolute control received no nitrogen and the highest N dose of 320 kg ha-1 was received in T6 (3 splits). The highest number of split application of N took place in T3, T4 and T5 (5 splits). LCC, SPAD and Green Seeker values increased gradually from initial knee high stage to tasseling stage of the crop. Nitrogen content in leaves also increased up to tasseling and was significantly influenced by different N management options. Highest N content of 3.92 % in leaves was observed in T5 at tasseling. The highest grain yield of maize (8072 kg ha-1) was recorded in T5 (Green Seeker based NDVI) which received 215 N kg ha-1 in 5 splits but was found on par with T3 (N25 if LCC value < 5), T4 (N25 if SPAD value < 50) which received 190 kg N ha-1 in 5 splits, T6 (FFP) that received 320 N kg ha-1 and T7 (STCR approach). Yield attributes that include cob weight, cob length, number of kernels per row and number of rows of kernels were higher in T5 which contributed to higher yield due to effective translocation of photosynthates from source to sink. Green Seeker, SPAD and LCC values correlated significantly and positively with N content in leaves and grain yield indicating that simple tools like Leaf Colour Chart, SPAD chlorophyll meter and Green Seeker can be effectively used for monitoring leaf N content in maize and there by rationalizing N application for achieving higher yields. Split application of Nitrogen based on crop demand is found useful instead of providing large quantity of nitrogen which is prone to various losses in the soil resulting in low N use efficiency and lower yields. The benefit - cost ratio was also high in T5 (3.32) followed by T3 (3.05) and T4 (2.92) in these dynamic N management approaches as compared to other practices evaluated in the study. It is clear from the study that the LCC, SPAD and Green seeker based nitrogen application can be recommended rather than blanket application of fertilizers. The timely and synchronized application of nitrogen as per requirement of crop at different stages of crop growth can give better yields rather than single application of fertilizers.
Description: D5737
Subject: Soil Science and Agriculture Chemistry
Theme: EVALUATING SITE SPECIFIC AND REAL TIME NITROGEN MANAGEMENT STRATEGIES FOR HYBRID MAIZE (Zea mays L.)
Research Problem: EVALUATING SITE SPECIFIC AND REAL TIME NITROGEN MANAGEMENT STRATEGIES FOR HYBRID MAIZE (Zea mays L.)
These Type: M.Sc
Issue Date: 2018
Appears in Collections:Thesis

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