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ThesisItem Open Access Studies on the fractionation of soil phosphorus and the absorption and retention of ammonium nitrogen in Kerala soils(Division of agricultural Chemistry, Agricultural College & Research institute Vellayani, Trivandrum, 1963) Narayanan Nambiar, P K; KAU; Money, N SA study was undertaken with the object of finding o u t t h e retention of ammonium nitrogen in different soils of Kerala when applied in the form of ammonium sulphate and leached after one day or one week contact. Eight soils differing in texture were taken and treated with ammonium sulphate solution of three different concentrations, viz., 52.50, 10500 and 21000 ,ug.N/lOO g. of soil under the laboratory conditions. The unadsorbed nitrogen was found out by estimating nitrogen in the supernatent liquid. The ammonium nitrogen retained by the soil was estimated after leaching the soil with known volume of water. The statistical evaluation of the relation between the textural separates and the ammonium nitrogen retained was also made.ThesisItem Open Access Influence of salinity on the germination and growth characteristics of rice(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1963) Remani, B; KAU; Money, N SA study was made of the influence of salinity on the germination, growth and yield of different varieties of rice. Germination was studied in the laboratory for five varieties using nine salts at different concentrations. Growth and yield characteristics were observed for two varieties in a pot culture experiment by flooding the soil with sea water for twenty four hours at different stages in the growth period of the plants. The percentage germination was reduced in all the varieties with increase in the concentration of the salt. For the same concentration the adverse effects of salts on germination increased in the order ammonium chloride ammonium sulphate < sodium chloride < sodium sulphate < potassium chloride < potassium sulphate < magnesium sulphate < calcium chloride. Chlorides were generally more toxic than sulphates. Among the cations, ammonium and potassium were the least toxic, sodium and magnesium were more so, while calcium was the most injurious.ThesisItem Open Access Physico-chemical and microbial studies on some 'Kari' soils of Kerala(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1964) Sukumara Pillai, V; KAU; Money, N SA study has been made of the morphological, physiochemical and microbiological properties of four typical profiles from the Kari areas of Vaikom Taluk. The soils are black to dark grey in colour, and can be texturally classed as clays or clay-loams. There is an irregular distribution of the soil separates in the profile , suggesting their formation by deposition and sedimentation.ThesisItem Open Access Studies on the salt-affected rice soils of Kerala(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1963) Gopalakrishnan Nair, P; KAU; 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.ThesisItem Open Access Studies on some forest soils of Kerala(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1964) Thomas, K M; KAU; Brito Mutunayagam, A P AThesisItem Open Access Effect of Calcium, Magnesium and Silicon on productive factors and quality of Rice(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1964) Padmaja, P; KAU; Verghese, E JThesisItem Open Access 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; KAU; Subramoney, N
