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Advisor: Pawar.D.D.
Publisher: Mahatma Phule Krishi Vidaypeeth, Rahuri
Language: en
Type: Thesis
Pages: 137; PP
Agrotags: null
Abstract: A field investigation entitled “Effect of drip fertigation on nutrient uptake, availability in inceptisols and yield of Bt. Cotton” was conducted during the Kharif season of 2015-16, at research farm of Interfaculty Department of Irrigation Water Management, Post Graduate Institute, Mahatma Phule Krishi Vidyapeeth, Rahuri, District Ahmednagar, Maharashtra, India with objectives to study the growth and yield of cotton as influenced by fertigation using different P sources, to standardize the optimal dose and schedule of the water soluble fertilizers (WSF) for Bt. cotton, to study the economic feasibility of Bt. Cotton under drip fertigation and to study the nutrients availability and uptake in cotton.The soil of experimental field was clay loam with low nitrogen availability (180.21 kg ha-1), medium in available phosphorus (18.43 kg ha-1) and high in available potassium (450.67 kg ha-1) content. The experiment was laid out in randomized block design with eight treatments replicated thrice. The experiment comprised of, T1- 100% fertigation, T2 - 75% fertigation (24:24:00), T3 - 50% fertigation, T4 - 75% fertigation (19:19:19), T5 - 75% fertigation (12:61:00), T6 - no fertilizer under drip irrigation, T7 - 100% conventional fertilizer under drip irrigation and T8 - 100% cconventional fertilizers under surface irrigation. In all fertigation treatments, fertilizers were applied in 14 splits at weekly intervals apportioned as per crop growth stages. The 100% fertigation (T1) registered significantly higher values of growth and yield attributes viz., plant height (179.4 cm), number of monopodial branches (4.90), number of sympodial branches (18.93) and number of boll per plant (113.48). The seed cotton yield obtained under 100% fertigation was significantly higher (39.85 q ha-1) than the surface irrigation method (28.11 q ha-1), but it was on par with T2 (75% fertigation). Fertigation was found to be more beneficial than conventional methods in respect to yield and water saving. The 100% fertigation treatment (T1) produced a significantly more yield (39.85 q ha-1) followed by 75% fertigation (T2) as 37.35 q ha-1 and 35.84 q ha-1 in T4. A total seasonal water requirement in drip and surface irrigation was 610.7 mm and 1376.4 mm, respectively resulted in water saving of 55.63% indrip irrigation. Significantly higher availability of nitrogen (169.31 kg ha-1), phosphorus (19.97 kg ha-1) and potassium (459.81 kg ha-1) in soil was recorded at harvest under 100% fertigation than the surface irrigation method. 100% fertigation treatment resulted into maximum uptake of nitrogen (156.39 kg ha-1), phosphorous (48.67 kg ha-1) and potassium (128.90 kg ha-1) by Bt. Cotton The cost of cultivation was mainly differed due to prices of WSF applied. The higher net monetary returns (Rs. 101040.1 ha-1) with B: C ratio of 2.24 was obtained in 100 % fertigation treatment (T1); however, it was at par with 75 % fertigation treatment (T2) as Rs. 96875 ha-1. On the basis of results obtained, it can be concluded that for cotton cultivation in clay loam soil, 75% fertigation in 14 weekly splits appropriated as per growth stages is an appropriate fertigation criteria to obtain optimum yield, maximum water use and economic returns in semiarid regions of western Maharashtra.
Subject: Land and Water Management Engineering
Theme: Land and Water Management Engineering
These Type: M.Sc
Issue Date: 2016
Appears in Collections:Thesis

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