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Authors: Jadhav, Y. H.
Advisor: Ahlawat, R. P. S.
Title: Response of Wheat (Triticum Aestivum L.) to Irrigation, Earthworm Inoculation and Nutrient Sources Under South Gujarat Conditions
Publisher: Agronomy Department, N. M. College of Agriculture Gujarat Agricultural University
Language: en
Type: Thesis
Pages: 226
Agrotags: null
Keywords: Agronomy
Abstract: A field ex periment was conducted during rabi season of 1992-93 and 1993-94 on clayey soil of the Pulse Research Farm, Gujarat Agricultural University. Navsari Campus, Navsari to study the response of wheat (Triticum aestivum L.emend .Fiori & Paol.) to irrigation. earthworm in oc ulation and nutrient sources under South Gujarat conditions. The expe riment was laid out in split-split plot design keeping irrigation levels (0.6. 0.8 and 1.0 IW/CPE ratios) in main plot. earthworm (no inoculation and inoculation} in sub plot and nutrient sources (organic. chemical and 1/2 organic + 1/2 c hemical) plus control (no fertilizer / manure) in sub-sub plot with four replications. Irrigation at IW/CPE ratio of 1.0 significantly enhanced the crop growth (plant height. shoot number. leaf area. l.AI and dry matter accumulation). yield attributes (number of effective shoots, spikelet number. grains per earhead and test weight) and eventually the grain and straw yields over 0.6 and 0.8 IW/CPE ratio. The mean increase I• n the grain yield over 0.6 IWjCPE ratio was 13.44 and 27.22 per cent under 0.8 and 1.0 IWjCPE ratios, respectively. Increasing irrigation ratios resulted in decreased nitrogen and increased phosphorus concentration in grain. So far as the total uptake of nutrients ('N' and 'P') is concerned, it significantly increased up to the highest ratio. A similar trend was also observed in case of protein yield. There was no effect of ascending irrigation levels on the post harvest fertility status and bulk density of the soil, but an improvement was noticed in the biological health of the soil as reflected by increasing earthworm population. In general, consumptive use increased while water use efficiency decreased with increasing moisture regimes. The net profit and B:C ratio were significantly the highest under 1.0 IWjCPE ratio. Earthworm inoculation significantly increased the plant height at 60 DAS. number of shoots at harvest. effective shoot number, earhead length, number of spikelets. grains per earhead and yield. The mean increase recorded by inoculated treatment over uninoculated was of the order of 1.60 q ha- 1 in grain yield and 1.43 q ha- 1 in straw yield. There was no effect of it on nutrients concentration in v plants. but significant increases occu~ed in total nitrogen uptake and protein yield. It significantly raisect the organic carbon and available phosphorus status of the soil. The results further indicated that earthworm inoculation was beneficial in enhancing monetary return. which was Rs. 748 ha- 1 more over no earthworm treatment. Application of recommended dose of nutrients. irrespective of source, significantly enhanced the crop growth and yield over control. with mean increase in grain yield of per cent under organIc. 1/2 organic + 1/2 chemical and chemical forms, respectively. Amongst the nutrient sources, chemical fertilizer and 1/2 organic + 1/2 chemical forms were at par and significantly superior over organic source, indicating complementary effect of organic manure in conjunction with chemical fertilizer. The concentration of nutrients ('N' and 'P') and their uptake were significantly the highest under chemical fertilizer while least under organic source. A similar trend was also noticed in respect OJ . protein yield. As to the chemical. physical and biological improvement in the soil, organic and 1/2 organl• c + 1/2 chemical forms were far superior over chemical source. Consumptive use and water use efficiency were highest under chemical source and decreased with its substitution by organic source. The net realization and B:C ratio obtained under chemical and 1/2 organic + 1/2 chemical forms were comparable and significantly superior over organic so~rce. The interaction between irrigation and nutrient source was found significant in regard to important yield attributes (number of effective shoots and grains per earhead) . and yield. 13M2 (irrigation at 1.0 IW/CPE ratio x nutrient application through chemical source) recorded significantly the highest grain yield • 1 . e . 43.61 q ha- 1 followed by 13M, (39.85 q ha- '). J2M2 (37.40 q ha-') and (36.54 q ha- 1 ). indicating that chemical source is superior over 1/2 organic + 1/2 chemical under plentyful irrigation, but at par when irrigation water is in short supply. The total uptake of nutrients. protein yield and net profit as well as B:C ratio were also significantly the highest under 13M2.
Subject: Agronomy
Theme: Ph.D. Thesis
These Type: Ph.D
Issue Date: 1995-12
Appears in Collections:Doctoral Theses

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