Browsing by Author "Reena Mathew"

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Consumptive use, pattern of soil moisture extraction and water use efficiency of bittergourd (Momordica Charantia L.) under varying irrigation and nitrogen levels
(Kerala Agricultural University, 1993) Manorama Thampatti, K C; Santha Kumari, G; Reena Mathew; Chandrasekharan, P
The influence of graded doses of nitrogen and varying levels of irrigation on consumptive use of water, paltern of soil moisture extraction, water use efficiency and f r u i t yield of biltergourd were evaluated during 1988-89 and 1989-90. The consumptive use of water and lit/Eo values of bittergourd increased progressively with levels of nitrogen and irrigation. At higher moisture regimes the variation in consumptive use and Ht/Eo values did not reflect in crop yield. Wale ruse efficiency of the crop maintained a positive relation with levels of nitrogen and a negative relation with levels of irrigation. The soil moisture extraction paltern was not influenced by nitrogen levels. Major part of water was extracted from upper layers of soil irrespective of treatments.
Effect of Azospirillum inoculation on seedling vigour in rice
(Kerala Agricultural University, 1994) Girija, D; Varadarajan Nair, P; Reena Mathew
Influence of summer cropping and fallowing on fertilizer use efficiency and productivity of rice
(Kerala Agricultural University, 1996) Jose Mathew; Reena Mathew; Kuruvilla Varughese; Santhakumari, G; Pillai, G R
Methane emission from wetland rice fields of Kerala
(Department of Agronomy, College of Horticulture, Vellanikkara, 2003) Reena Mathew; Balachandran, P V
Moisture retention characteristic of red and forestry soil of Kerala
(Department of Agronomy, College of Horticulture, Vellanikkara, 1985) Reena Mathew; Vikraman Nair, R
The investigation was undertaken in the College of Horticulture, Vellanikkara, during the period from November 1983 to September 1984. Soil samples were collected from Cannanore, Calicut and Trivandrum districts for red soil and Trivandrum, Trichur and Wynad districts for forest soil. Moisture retention studies were done at six applied pressures viz. 0.3, 1, 3, 5, 10 and 15 bars and these values were correlated with contents of textural separates and organic carbon using multiple regression analysis. The study revealed that moisture retention by 2 mm sieved soil was higher for forest soil than red soil at all the six tensions. The moisture contents on weight basis at 0.3 bar for the two soils were 24.85 and 10.45 per cent, respectively. The corresponding values at 15 bars were 18.15 and 7.21 per cent. In both the soil, the contents of fine fraction (clay and silt) showed significant positive correlation with moisture retention while the correlation with fine sand was significant and negative. Organic carbon was found to have no bearing on moisture retention as indicated by the lack of significant correlation at any of the tensions studied. The gravel fraction in the case of forest soil was found to retain moisture and the values at field capacity and permanent wilting point were 10.8 and 9.46 per cent, respectively. The moisture retention of the soil including gravel amounted to 26.90 per cent at field capacity and 20.2 per cent at permanent wilting point, on volume basis. Prediction equations were developed to estimate the moisture retention at 0.3 and 15 bars of the 2 mm sieved soil from a knowledge of the contents of organic carbon and textural constituents. In the case of forest soil, another set of prediction models was also worked out to arrive at the moisture retention including gravel at these soil moisture constants.
Moisture retention characteristics of red and forest soils of Kerala
(Kerala Agricultural University, 1985) Reena Mathew; Vikraman Nair, R
Moisture retention studies of red and forest soils were conducted at the College of Horticulture at six different tensions ranging from 0.3 to 15 bar. The results revealed that the clayey textured forest soil retained higher moisture at all the tensions than red soil which is sandy c!ay loam in texture. The field capacity and wilting coefficient values were 24.85 and 18.15 per cent, respectively for forest soil as against 10.45 and 7.21 percent for red soil. About 50 percent of the available water was removed when the tension increased from 0.3 to 1 bar. Significant positive correlations were obtained between moisture contents at different tensions and the contents of clay and silt while the relation with fine sand was significant and negative. Organic carbon failed to show any significant influence on moisture retention but the content of gravel had a depressing effect on moisture percentage especially at 0.3 bar. Regression equations with high predictability have been developed to estimate field capacity and witting coefficient from the contents of organic carbon, textural separates and gravel.