Browsing by Author "Janardhanan Pillai, S"

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Evaluation and nutritional management of fodder crops in summer rice fallows
(Department of Agronomy, College of Agriculture, Vellayani, 2001) Salini Rani, V G; Janardhanan Pillai, S
A field experiment was conducted at the Cropping Systems Research Centre, Karamana, Thiruvananthapuram during February, 2000 - May, 2000 to evaluate the production potential and quality of different fodder crops in summer rice fallows and to study the changes in physio- chemical properties of soil due to fodder cropping and to work out the economics of fodder production. The treatment consisted of combined application of two levels of vermicompost (2.5 t ha' and 5 t ha") and two levels of chemical fertilizers (50 per cent and 100 per cent POP recommendation) on two cereal fodders (bajra and sorghum) and two leguminous fodders (Sesbania rostrata and cowpea). The experiment was laid out in split plot design with four replications. Plant height, leaf area index and leaf: stem ratio differed significantly with the application of different combinations of vermicompost and chemical fertilizers. All these parameters were found to be increasing with increasing levels of vermicompost and chemical fertilizers. Integrated application of vermicompost (5 t ha") and chemical fertilizers (100 per cent POP recommendation) produced the maximum value for all the growth parameters. The green fodder yield and dry fodder yield of all the fodder crops were favourably enhanced by vermicompost application. Application of highest dose of vermicompost combined with the highest dose of chemical fertilizers recorded the maximum fodder yield III all the four fodder crops. Crude protein content of fodder crops increased with incremental doses of nutrients where as crude fibre content decreased with incremental doses of vermicompost and chemical fertilizers. Incremental doses of the vermicompost and chemical fertilizers decreased the bulk density of soil where as water holding capacity increased with higher doses of nutrients. Available nitrogen, phosphorus and potassium status of soil were improved and showed an increasing trend with the increasing levels of vermicompost and chemical fertilizers. Green fodder yield was maximum III cowpea while dry fodder yield was maximum in sorghum. Cowpea plants recorded the highest crude protein content, nitrogen content and potassium content followed by Sesbania rostrata. Sorghum recorded the highest crude fibre content and cowpea recorded the' lowest crude fibre content. The uptake of nitrogen and phosphorus were maximum III Sesbania rostrata whereas cowpea recorded the maximum potassium uptake.
Integrated weed management in lowland rice
(Department of Agronomy, College of Agriculture, Vellayani, 2004) Seema, V; Janardhanan Pillai, S
A field experiment was conducted at Cropping Systems Research Centre (CSRC), Karamana, Thiruvananthapuram to evolve a suitable integrated weed management practice for lowland nee. The study was conducted during the viruppu season of 2003. The field experiment was laid out in randomised block design having three replication with twelve treatments. The treatments include different herbicides in combinations, herbicides + hand weeding, hand weeding twice and unweeded control. Butachlor, 2,4~D, pretilachlor, anilofos + 2,4-DEE, anilofos, ethoxysulfuron, metsulfuron methyl and chlorirnuron- ethyl were the different herbicides used in the experiment. The rice variety used for the experiment was Kanchana. The results of the study revealed that grasses, broadleaved weeds and sedges competed with the rice crop. Different weed management practices significantly influenced the intensity and distribution of weeds ... The lowest dry matter of weeds was recorded by anilofos + ethoxysulfuron followed by one hand weeding which was on par with anilofos -+ ethoxysulfuorn alone. All the weed management treatments resulted in improved yield attributes and higher grain yield compared to weedy check. The plots treated with anilofos + ethoxysulfuron followed by hand weeding at 40 DA T recorded the highest grain yield. This treatment resulted in enhanced plant height, number of productive tillers un', LAI and nutrient uptake of rice. The yield attributes and grain yield were significantly increased by this treatment. The total weed population, weed dry matter production and nutrient removal by weeds were also reduced and weed control efficiency was increased by this treatment. Unweeded control recorded the lowest gram yield. No herbicide used in this experiment resulted m residual toxicity after the cropping season. Manual weeding is expensive, laborious and time consummg. Labour non-availability at peak crop season for weeding also poses great threat. Readymix application of anilofos + 2,4-DEE (T3) resulted in highest B:C ratio of 1.41 and butachlor + 2,4-D (T,) with 1.40. Pre-emergence application of anilofos + ethoxysulfuron followed by one hand weeding at 40 DA T (T 8) was the most remunerative treatment.
Response of mahsuri to major nutrients and schedule of nitrogen application
(Kerala Agricultural University, 1992) Savithri, K E; Janardhanan Pillai, S; Chidananda Pillai, M R; Tomy, P J
Experiments conducted at the Regional Agricultural Research Station, Pattambi during the three consecutive wet seasons from 1982-83 to 1984-85 revealed that under transplanted condition, a fertilizer dose of 50:25:25 kg NPK/ha is sufficient for Mahsuri. The best schedule of application of nitrogen is 50% as basal, 25% at 40 DAT and the remaining 25% at 60 DAT.