Browsing by Author "Subramoney, N"
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Item Estimation of loss of nitrogen from different nitrogenous fertilizers when applied to different soils under water-logged condition(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1968) Krishnakumari, M; Subramoney, NThe investigation envisaged the study of the loss of nitrogen due to leaching from different nitrogenous fertilizers applied to different types of soil and their comparative efficiency on the performance of rice variety I.R .8. The study has enabled the following conclusions to be drawn. 1. The loss of nitrogen by leaching is not reduced even when nitrogen is applied in the water insoluble form. 2. That the loss of nitrogen through leaching even from the fertilizer containing insoluble form of nitrogen might be due to the reaction between fertilizer and soil solution. 3. The loss of nitrogen depends on the texture of soil receiving nitrogenous fertilizers, maximum loss occurring in sandy soil and minimum in clayey soil. 4. The maximum loss of nitrogen through leaching occurs between 12 and 24 hours after the application of fertilizers.Item Influence of Calcium and Magnesium in increasing the efficiency of fertilisers for rice and Calcium and Magnesium status of some typical rice soils of Kerala(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1963) Thomas Varghese; Subramoney, NItem Occurrence of blue green algae in the acid soils of Kerala(Kerala Agricultural University, Vellanikara, 1966) Anandavalli Amma, P; Aiyer, R S; Subramoney, NItem Physiological disease of paddy due to iron toxicity(Kerala Agricultural University, Vellanikara, 1961) Subramoney, N; Balakrishna Kurup, T KItem Salt tolerance of certain varieties of paddy(Kerala Agricultural University, Vellanikara, 1968) Subramoney, N; Anandavally Amma, PItem Studies on copper and zinc status of Kerala rice soils and the response to these elements by IR-8(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1970) Balakrishnan Nayar, C; Subramoney, NItem Studies on H2S injury to rice plants(Kerala Agricultural University, Vellanikara, 1969) Yogesan Nair, J; Subramoney, NItem Studies on the effect of nitrogen on the growth, yield and nutrient uptake of two newly introduced rice varieties (Tainan 3 and Taichung Native I)(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1967) Prema, M K; Subramoney, NA pot culture study was conducted, using specially designed concrete pots to determine the response of Tainan 3 and Taichung Native 1 to applications of varying levels of nitrogen and to compare their performance. The study has enabled the following main conclusions to be drawn. 1. The two varieties exhibited marked differences in their agronomic characters. 2. Nitrogen application at varying levels had significant influence on the various agronomic characters, such as plant height, number of tillers per plant, length and weight of panicle and the number of productive tillers per plant, length and weight of panicle and the number of productive tillers. All these were enhanced by increasing levels of nitrogen.Item Studies on the hydrogen sulphide injury on paddy plants(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1966) Yogeshan Nair, J; Subramoney, NPaddy plays a very decisive role in the economy of this country . This is more so in the case of Kerala for its population depends mainly on rice as the staple food. Inspite of the earnest efforts to attain self suffiency in rice requirements, the annual production has reached only to meet 50 per cent of the actual needs Paddy has been known to be affected by many physiological diseases, among which H2S injury is the most serious. The disease causes considerable reduction in grain and strew yields.Item Studies on the lack of response of phosphatic fertilizers to rice in the laterite soils of Kerala(Division of agricultural Chemistry, Agricultural College & Research institute Vellayani, Trivandrum, 1970) Akbar, A; Subramoney, NItem Studies on the salt-affected rice soils of Kerala(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1963) Gopalakrishnan Nair, P; Subramoney, NA pot culture study was conducted using different salts in different concentrations so as to produce varying conductivities in the soil. The influence of different concentrations of various salts on the growth and yield characteristics of rice were studied. Fourteen typical soil samples from the salt- affected areas in Kerala were also examined for their chemical and mechanical composition.Item Sulphur status of Kerala soils(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1966) Jacob, C I; Subramoney, NA study was made of the forms and distribution of the sulphur in fourteen wet land and six dry land profiles. Relationship between different forms of sulphur and organic carbon was worked out. The main findings are as follows:- 1. Kerala soils in general are rich in total sulphur 2. Wet land soils contain more sulphur than dry land soils. 3. Total sulphur is significantly and positively correlated with organic carbon for all the three layers. 4. Maximum reserves of sulphur are found in the Kari soil of Kuttanad. 5. Excepting the Kari soils, in general the total sulphur decreases with an increase in the depth of the profile.