Reprints

Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1975

Browse

Filters

19792

Settings

Author: search.filters.author.Sundaresan Nair, C

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Phosphate fractions of Kerala rice soils in relation to their occurrence and pedogenesis
    (Kerala Agricultural University, 1979) Aiyer, R S; Sundaresan Nair, C
    to their pedogenesis was conducted. The total P content varies between 816 and 917 ppm. The Fe-P fraction is the most dominant fraction in all the soils accounting for 21.8 to 39.3 per cent of the total P in the soils. AI-P is the second most abundant P fraction, accounting up to 12.7 to 25.8 per cent of the total P. The Ca-P fraction varies between 5.9 and 103 per cent. These soils contain only 6.0 to 9.5 per cent and 2.7 to 5.6 per cent respectively of reductant-P and occluded-P. The higher Ca-P incidence in the soils under marine influence has been attributed to the reaction of soluble Ca in the sea water with reduced Fe-P compounds and the formation of more insoluble Ca-P compounds. The results indicate that continuous alluviation by periodical floods in the formation of all the soils under study coupled with the marine influence in all the soils except the lateritic alluvium of the ribbon valleys of the midlands appear to maintain their juvenility.
  • No Thumbnail Available
    Item
    Effect of liming and application of mussoorie phosphate on the yield of green gram, var. Co-1, grown in the upland laterites of Kerala state
    (Kerala Agricultural University, 1979) Sundaresan Nair, C; Aiyer, R S
    Green gram variety Co-1 was grown with different forms and levels of phosphates superimposing a treatment of fully burnt lime at 500 kg/ha. The forms of phosphates compared were Mussoorie phosphate, single superphosphate and a complex fertilizer, factomphos (16:20). The results indicate that the response of green gram variety Co-1 is limited up to 15kg PgCyha and that between the forms, there is no significant difference. The use of Mussoorie phosphate entails a net saving of Rs. 50 per ha at application rates of 15 kg PjOs/ha. After harvest, if the tops are recycled three-fourths of the N applied will be returned to the soil. It has been shown that the pulse crop can give a net profit of Rs, 500 per ha under Kerala conditions.