Loading...
![Thumbnail Image](assets/images/Collection.png)
Theses
Browse
2 results
Search Results
ThesisItem Open Access Release of soluble aluminum in soils under submerged conditions and its effect on rice(Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, 1984) Alice Abraham; KAU; Koshy, M MA study has been made of the extent of aluminium toxicity in relation to other important characters in the acid Rice soils of Kerala with a view to evolving suitable ameliorative measures. The submerged wet-land rice soils of Kerala showing a pH value of less than 6.0 were found to contain appreciable amounts of exchangeable aluminium. The aluminium saturation of the total and effective CEC of these soils were also very high and above the critical limits for rice. Flooding of these soils in water resulted in a rise in pH and EC, as well as water soluble and exchangeable iron. Peak values for these parameters were obtained by 20-30 days of flooding, after which the pH remained steady while EC and iron showed a decreasing trend . Water soluble and exchangeable aluminium, on the other hand, registered a significantly lower content after the 6th day and the trend continued till the 30th day.ThesisItem Open Access Effect of potassium nutrition on the yield and quality of cassava(Department of soil science and agricultural chemistry, College of Agriculture, Vellayani, 1983) Gopalakrishnan Nair, P; KAU; Aiyer, R SInvestigations were carried out as the College of Agriculture, Vellayani to find out the optimum dose and time of application of potassium to conserve in relation to yield and quality. For this purpose a seed culture experiment with nutrient solutions at varying duration of it application and a microplot field experiment with different levels of E were conducted during 1977-80. Before conducting the field experiment, two crops of cassavawere taken in the same plot without applying potassium and thus bringing down the available K to a low level.