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Articles by S.K. Natarajan
Total Records ( 5 ) for S.K. Natarajan
  B. Bhakiyathu Saliha , S. Krishnakumar and S.K. Natarajan
  Field experiments were conducted during August-December 2002 (Kharif) and January-April (Summer season) 2003 to study the effect of incorporation of biocompost on lowland rice with four treatments viz., M1-Control, M2-FYM at the rate of 12.5 t ha -1, M3-GLM at the rate of 6.25 t ha-1 and M4-Biocompost at the rate of 3 t ha-1. Rice varieties Co 43 and IR 50 were used as test crops. Among the different organic manures used, application of biocompost at the rate of 3 t ha-1 registered higher yields and favourably improved the soil chemical and biological properties than the other treatments. Thus, the conversion of by-products like pressmud and distillery spentwash into a value added eco-friendly organic manure can be considered as a commercially viable, environmentally acceptable and practically enforceable option for improving the crop productivity and soil fertility status of the soil.
  S.K. Natarajan , M. Ganapathy , R. Nagarajan and S. Somasundaram
  A field experiment was conducted in the saline field of Annamalai University, experimental farm, Annamalai Nagar during Kharif season of 2000-2001, to study the screening of rice accessions for growth and yield attributes contributing to salinity tolerance. The experiment was laid out in Randomized Block Design with three replications. Fifteen rice accessions from the International Rice Soil Stress Tolerance Screening Nursery Trial (IRSSTN) of IRRI were used for the study. Based on the grouping, the rice accessions were grouped into High Yielding Tolerant (HYT), High Yielding Susceptible (HYS), Low Yielding Tolerant (LYT) and Low Yielding Susceptible (LYS). The results revealed that the rice accessions of the high yielding and tolerant group recorded a higher value for the yield characters viz., number of productive tillers/hill, number of filled grains/panicle and thousand grain weight in which Rice Acc. No. 12 (IR-60494-2B-18-3-2-3) recorded the highest value for yield characters. The rice accession of the high yielding and tolerant group recorded a higher value for the grain and straw yield of which Rice Acc. No. 12 (IR-60494-2B-18-3-2-3) recorded the highest value for grain and straw yield. Based on the results of the investigations, it clearly indicates the direct effects of growth and yield attributes on the higher yield of rice accessions for salinity tolerance. It appears that the number of productive tillers/hill, number of filled grains/panicle and thousand grain weight had direct influence on the grain yield of rice accessions grouped in high yielding and tolerant category for saline soils.
  S. Krishnakumar , A. Saravanan , K. Ramesh , S.K. Natarajan , V. Veerabadran and S. Mani
  Investigations were carried out to study the effect of organic farming with various sources of organic manures and their combinations on the soil physical properties, nutrient availability and biological properties during July 2003 to October 2004. The recommended dose of NPK fertilizer was 90: 40: 40 kg ha-1 for Kharif and Rabi rice (ADT 36). The recommended dose of 90 kg N ha-1 was substituted through organics viz., FYM, Sesbania rostrata, composted coirpith alone and in combination with neem cake and Azolla. Application of FYM+NC at the rate of 90 kg N ha-1 showed significantly reduced bulk density and increased hydraulic conductivity, water holding capacity and percent pore space during Kharif’ 04 and Rabi’ 04. The biological properties like bacteria, fungi and actinomycetes also higher in the same treatment. FYM+NC (T6) gave significantly higher grain yield (5675 kg ha-1 during Kharif and in Rabi was 5175 kg ha-1. Higher straw yield (6520 kg ha-1) in Kharif and in Rabi was 6020 kg ha-1 in the same treatment.
  S. Krishnakumar , R. Nagarajan , S.K. Natarajan , D. Jawahar and B.J. Pandian
  To optimize the NPK fertilizers requirements with hybrid rice (CORH 2) and graded levels of NPK during (Pishanam) wet season (September 2000 to January 2001), a field experiment was conducted in Alfisols of Agricultural College and Research Institute, Killikulam, Tamil Nadu. The experiment was laid out with 14 treatments of NPK combinations. The results indicated that among the treatments, application of 150:75:50 kg N: P2O5: K2O ha-1 had registered the higher grain yield of hybrid rice. The 150:50:50 kg N, P2O5 and K2O ha-1 fertilizer treatment had the higher total Phosphorus and K uptake. The N, P2O5 and K2O doses, respectively 200: 75:75; 200:10:100 and 200:50:75 kg ha-1 resulted in higher soil available N, P and K, irrespectively in post harvest soils after the CORH2 rice hybrid. The physical optimum levels for getting the maximum grain yield for the medium duration rice hybrid CORH2 was found to be 151:66:57 kg N, P2O5 and K2O ha-1. The economic optima for N, P2O5 and K2O are 149:62:56 kg ha-1, respectively for obtaining the highest grain yield.
  T. Subramani , S. Nalliah Durairaj , S.K. Natarajan and S. Thiruvarasan
  A field experiment was conducted to develop a system approach nutrient management package for advance kar season rice based cropping system in Tambaraparani command area. The nutrient treatments were imposed only to rice crops and no manure/fertiliser applied to rice fallow blackgram. The nutrient management packages adapted to advance kar season rice consisted of green manure alone, 100% NPK with and without green manuring along with control. In pishanam season rice, various graded level of fertiliser treatments were adapted. Application of green manure along with recommended NPK recorded higher grain yield and yield attributes of advance kar season rice. The residual effect of integrated nutrient treatments adopted to advance kar rice increased the grain yield and yield attributes of rice fallow blackgram. Combined application of green manure and 100% NPK fertiliser to advance kar season rice, raising rice fallow blackgram preceding to pishanam season rice and application of 100% NPK fertiliser to pishanam season rice recorded higher yield and yield attributes, which was on par with 75% recommended NPK to pishanam season rice, which recorded higher benefit: cost ratio.
 
 
 
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