Browsing by Author "Rajagopal, C K"

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    Availbale zinc, copper, iron and manganese status of the acid rice soils of Kuttanad, Kerala state
    (Kerala Agricultural University, 1975) Aiyer, R S; Rajagopal, C K; Money, N S
    Determination of available zinc, copper, iron and exchangeable manganese in the [Cari, Karapadom and Kayal soils of Kuttanad region, Kerala State, revealed that all the three soil types are highly deficient in available copper (90%). Available zinc was deficient in 50% of the Kayal soils studied. High amounts of available iron in the Kari soils suggest the possibility of iron toxicity to rice in these soils. Significant and positive correlations existed between available copper on the one hand and organic carbon (r= + 0.400) and CEC (r= + 0.566! on the other. Available iron was significantly and positively correlated with organic carbon (r= +0689) and CEC (r= -f 0.566) and significantly and negatively correlated with pi! (r= - 0.425) and exchangeable Ca + Mg (r= - 0.408). The results warrant application of copper in all the three types of Kuttanad soils and of zinc in the Kayal soils.
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    Status of available micronutrient cations in the soils of Kerala
    (Kerala Agricultural University, 1977) Rajagopal, C K; Moosa Sheriff, M; Selvakumari, G; Jabarani, W
    Fourhundred and seventyeight soil samples collected from all over Kerala State, were analysed for available zinc, copper, iron and exchangeable manganese. The pH and organic carbon of the soils were also determined. Available copper was found to b3 deficient in all the districts of Kerala. Available zinc and exchangeable manganese also were found deficient in many districts. The status of available iron was quite good in all the districts and might be reaching toxic levels in some areas. The relationship of micronutrients with pH, and organic carbon were discussed. The study highlights the necessity to investigate the nature of organic matter in relation to micronutrient availability, so that appropriate maas'jres can bs adopted for lessening fixation of micronutrients applied to soil.