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|Title:||Studies on distribution and transformation of soil zinc and response of rice to nutrients in traditional and system of rice intensification (sri) methods of cultivation|
|Agrotags:||Seed Science & Technology|
|Abstract:||A study was conducted on the “Distribution and transformation of soil zinc and response of rice to nutrients in traditional and System of Rice Intensification (SRI) methods of cultivation”. Soil samples were analysed from paddy growing areas of Gangavati taluk in Northern Dry zone (zone 3) and Hangal taluk in Hilly zone (zone 9) of Karnataka to find out the distribution of zinc fractions and their relationship with soil properties. The order of magnitude of different zinc fractions was water soluble plus exchangeable zinc < organically bound zinc < crystalline sesquioxide bound zinc < amorphous sesquioxide bound zinc < manganese oxide bound zinc < residual zinc. An incubation study was conducted in the laboratory to know the transformation of applied zinc (10 kg ZnSO4 and 25 kg ZnSO4 ha-1) in Gangavati and Hangal soils under field capacity and submergence moisture regime for 120 days. Water soluble plus exchangeable, organically bound and crystalline sesquioxide bound forms of Zn showed a decrease and manganese oxide bound, amorphous sesquioxide bound and residual forms of zinc showed an increase with increase of incubation period in both moisture regimes. Hence, the magnitude of decrease and increase was more under submergence than field capacity moisture condition. A field experiment was carried out on a Calciustert to know the response of rice to different methods of cultivation and nutrient levels. Significantly taller plants with higher number of tillers and higher dry matter production were noticed in SRI method of cultivation at all the growth stages as compared to traditional method. SRI method recorded significantly higher yield attributes and grain and straw yield compared to traditional method of cultivation. Significantly higher concentration and uptake of plant N, P, K and Zn and residual available N, P, K and Zn in soils were recorded in SRI method as compared to traditional method. Application of 75 per cent RDF + biofertilizers with 25 kg ZnSO4 per ha resulted in significantly taller plants, higher number of tillers, higher dry matter and higher grain and straw yield and yield attributes. Significantly higher concentration and uptake of plant N, P, K and Zn and residual available N, P and Zn in soil were recorded in treatment receiving 75 per cent RDF + biofertilizers with 25 kg ZnSO4 per ha. The 75 per cent RDF + biofertilizer with 25 kg ZnSO4 per ha under SRI method of cultivation was found to be the best treatment which recorded the highest yield of rice.|
|Appears in Collections:||Thesis|
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