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Articles by L. Gurusamy
Total Records ( 5 ) for L. Gurusamy
  L. Gurusamy , K. Omar Hattab , P.S. Vijayakumar , S. Suganya and V.B. Muthukumar
  A field experiment was conducted in loamy sand soils of Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal, Union Territory of Pondicherry, India to find out the rice performance under two different soil conditions by raising sesame in previous season and without it, during the year 2004-05 in two consecutive seasons in a Factorial Randomized Block Design (FRBD). The field was divided into 60 plots and in the summer season sesame was raised in 30 plots and the other 30 plots were kept fallow. In the next season (Kharif), rice was raised in all the 60 plots of two different situations viz., with sesame as previous crop (Situation I) and without sesame as pervious crop (Situation II) with two rice cultivars viz., ADT 38 and KR 99001 and five levels of nitrogen viz., 0, 50, 100, 150 and 200 kg N ha-1. The uptake of Nitrogen (N), phosphorus (P) and potassium (K) by sesame was 30.4, 10.2 and 26.3 kg ha-1, respectively, resulted in soil available N, P and K loss of 37.0, 19.8 and 29.0 kg ha-1, respectively. The N and K uptake was equal under both situations at Active Tillering (AT) and Panicle Initiation (PI) but P was accumulated more in situation II in the stage AT but comparable at PI. This might be due to initial low requirement of nutrients met by inorganic sources and later situation I managed the nutrient lost in previous season with mineralization process, whereas the P, though applied as basal, might not be fully available in the initial stages itself and might have been fixed. The nutrient uptake by straw was higher in situation II owing to higher dry matter production and grain uptake was comparable because grain nutrient content is genetic character, not much influenced by management practices. The efficiency parameters (agronomic efficiency, physiological efficiency, harvest index and apparent N recovery) were found to be higher in situation I over situation II and they were more pronounced at lower levels of N.
  N. Thavaprakaash , K. Velayudham and L. Gurusamy
  Field experiments were conducted on sandy clay loam soils during late Rabi (January-March) and Kharif (June-September) seasons of 2002 to study the effect of herbicides at low concentrations as growth regulators on productivity of baby corn. The experiment was laid out in randomized complete block design with three herbicides each at two different concentrations (2,4-D @ 25 and 50 ppm, atrazine @ 50 and 100 ppm and glyphosate @ 5 and 10 ppm) along with control (water spray) and absolute control (no spray). The results were indicative that low herbicide concentrations promoted the growth and yield attributes in baby corn. Application of 2,4-D @ 50 ppm significantly increased growth parameters (plant height, number of green leaves plant-1, LAI and DMP) and yield attributes viz., length of cob and corn, weight of cob and corn, whereas significantly reduced cob-corn ratio, in comparison with 2,4-D @ 25 ppm and both concentrations of either atrazine or glyposate. Phenological stages such as days to tassel emergence and cob initiation and yield attributes viz., width of cob and corn, number of cobs plant-1, No. of cobs ha-1 were not significantly influenced by the herbicides. Increased growth parameters (LAI and DMP), yield attributes (length of cob and corn, weight of cob and corn) due to 2,4-D @ 50 ppm led to higher green cob yield (14.2% over control) and green fodder yield of baby corn over control.
  L. Gurusamy , K. Omar Hattab , N. Gunasekhar , P.S. Vijayakumar and V.B. Muthukumar
  A field experiment was conducted in loamy sand soils to study the impact of sesame crop on the dry matter production, nutrient uptake and yield of succeeding rice crop during the year 2004-05 in two consecutive seasons in a Factorial Randomized Block Design (FRBD). The field was divided into 60 plots and in the Summer season, sesame crop was raised in 30 plots and the other 30 plots were kept fallow. In the next season (Kharif), the rice crop was raised in all the 60 plots of two different situations viz., with sesame as previous crop (Situation I) and without sesame as pervious crop (Situation II) with two rice cultivars viz., ADT 38 and KR 99001 and five levels of nitrogen (N) viz., 0, 50, 100, 150 and 200 kg N ha-1. The Dry Matter Production (DMP) at Active Tillering (AT) stage was high in situation II over situation I and not so at Panicle Initiation (PI) stage, might be due to low nutrient status at AT caused by previous season sesame crop’s removal, might be overcomed at PI by the nutrient addition from mineralizing sesame stubbles. The variation in the situations did not bring any significant variation in grain yield, but slightly higher yield was noticed in situation II over situation I. Both ADT 38 and KR 99001 manifested higher yields at 150 kg N ha-1 in both the situations revealed the fact that this level of N is sufficient for better growth and development of rice crop. The straw yield was comparable in both the situations. The nitrogen and potassium (K) uptake was equal under both the situations at AT and PI but phosphorous (P) was accumulated more in situation II at AT but comparable at PI. This might be due to initial low requirement of nutrients met by inorganic sources and later the situation I managed the nutrients lost in previous season with mineralization process, whereas the phosphorous, though applied as basal might not fully available in the initial stages itself, might be fixed. The nutrient uptake by straw was higher in situation II owing to higher DMP but grain uptake was comparable because of genetic nature.
  N. Thavaprakaash , R. Jagannathan , K. Velayudham and L. Gurusamy
  Analytical study was carried out to study the influence of phenology and accumulated heat units of baby corn in different seasons. Baby corn crop was raised during late rabi 2002, kharif 2002, late rabi 2002-03 and summer 2003 seasons. The observations on days required for attainment of different phenophases viz., seedling, peak vegetative, tasseling, silking, first harvest and last harvest were recorded. Heat units such as Growing Degree Days (GDD), Photo Thermal Units (PTU), Helio Thermal Units (HTU), Relative Temperature Disparity (RTD), Heat Unit Efficiency (HUE), Photo Thermal Index (PTI) and Seasonal efficiency were worked for different seasons of baby corn. The yield obtained during four seasons of baby corn crop was related with the different heat units calculated during crop growth seasons. The results revealed that among the different indices GDD, HTU, PTU and RTD had negative relationship whereas HUE, PTI and Seasonal efficiency had positive relationship with yield of baby corn. Thus, the indices such as HUE, PTI and Seasonal efficiency are seem to be effective in taking into account and expressing the effect of varying ambient temperature on the duration between the phenological events for comparing the crop response to the ambient temperature between different phenological stages.
  Gunasekhar Nachimuthu , V. Velu , P. Malarvizhi , S. Ramasamy and L. Gurusamy
  Field experiment was conducted at the wetlands, Tamil Nadu Agricultural University, Coimbatore in Noyyal series deep clay soil (Vertic ustochrept), to standardise the Leaf Colour Chart critical value (LCC cv.) and the rate of nitrogen application in CO 47 rice variety. The study was conducted in factorial randomized block design with three replications. The treatments included three levels of LCC cv. (LCC cv. 3, 4 and 5) with different rates of N application (20, 25, 30 and 35 kg ha-1 at a time) along with three checks (control, blanket N (150 kg N ha-1 in four equal splits) and manage N practices (150 kg N ha-1 in four unequal splits)). LCC readings were measured every week from 21 Days After Sowing (DAS) to 84 DAS and nitrogen fertilizer was applied as per treatment schedule. The performance of blanket N and manage N were almost comparable among themselves in all aspects. Grain yield and straw yield increased with increasing LCC levels. The physical and economic optimum doses were found to be 141 and 139 kg N ha-1 to get the grain yield of 5356 and 5350 kg ha-1 respectively. LCC cv.5 which received 30 kg N ha-1 each time with a total dose of 150 kg N ha-1 recorded a grain yield of 5045 kg ha-1 was in corroboration to the predicted optimum dose and yield and also it gave a higher net income than blanket N. LCC cv.4, which received 20 kg N ha-1 each time with a total dose of 60 kg ha-1 recorded comparable yield with blanket N with a saving of 50% fertilizer nitrogen. Hence, under direct wet (drum) seeded condition, L5N30 (LCC cv.5 at the rate of 30 kg N ha-1 each time) can be recommended for a high resource farmer to get higher net income and L4N20 (LCC cv.4 at the rate of 20 kg N ha-1 each time) can be recommended for a low resource farmer to get 50% fertilizer N saving and comparable rice yields with the blanket N.
 
 
 
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