Phosphorus nutrition of rice
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Date
1985
Journal Title
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Department of Agronomy, College of Agriculture, Vellayani
Abstract
With a view to study the relative efficiency of various levels and methods of phosphorus application to rice variety, Triveni, an experiment was conducted in the wetlands of the Instructional Farm attached tot he College of Agriculture, Vellayani, during the first and secondcrop seasons of 1983-'84. The various treatments tried were
1. Control ( No phosphorus)
2. Full basal ( 35 kg P2O5/ha)
3. 3/4 basal + 1/4 foliar
4. 3/4 basal
5. 1/2 basal + 1/4 foliar
6. 1/4 basal + 1/4 foliar
7. l/2 basal.
8. Soaking seeds in KH2PO4 (Potassium dihydrogen phosphate) - 20 per cent solution and no phosphorus in the main field
9. Dipping seedling roots in KH2PO4- 1.5 per cent solution and no phosphorus in the main field.
10. Dipping seedling roots in 2.0 per cent Diamonium phosphate and no phosphorus in the main field.
11. Dipping seedling roots in superphosphate slurry and no phosphorus in the main field.
12. Application of 35 kg P205 in the nursery and no phosphorus in the main field.
The experiment was laid out in a randomised block design with three replications. The study revealed that the different levels and methods of phosphorus application had no effect on the various growth characters such as plant height, number of tillers, leaf area index and dry matter production.The yield and yield attributes also were not influenced by the levels and methods of phosphorus application\ except the weight of panicle . Phosphorus had no effect on the number of productive tillers per square metre, length of panicle, number of grains per panicle, sterility percentage and thousand grain weight. The grain and straw yield also were not influenced by phosphorus application. However# the highest grain yield was given by treatment number 12 in both seasons. Studies on chemical composition and uptake of nutrients showed that the uptake of nutrients was not influenced by the levels and methods of phosphorus application. The pattern of phosphorus uptake showed a gradual increase from maximum tillering to panicle initiation followed by a rapid increase upto harvest.
The total nitrogen, available phosphorus and exchangeable potassium status of the soil were not influenced by phosphorus application. The available phosphorus status of the soil increased gradually upto maximum tillering stage, showed a slight decrease by panicle initiation and this decreasing trend was continued till harvest. The maximum net profit of Rs.3199.30 was obtained by the application of the full dose of phosphorus to the nursery .
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