Citation
Mohd. Khanif Y., . and Choudhury A.T.M.A., . and Aminuddin H., . and Zakaria W., . (2002) Potassium requirement of rice crop in Malaysian soils. [Proceedings Paper]
Abstract
Investigation conducted at the Muda Irrigation Scheme Kedah showed that the exchangeable potassium K content in rice soils ranged from 0.08 to 0.44 cmol kg-1. Five out of sixteen soils studied were found deficient in K. A follow up adsorption study indicated that K adsorption varies among soils. Maximum K adsorption capacity calculated from Langmuir equation is higher in soil with higher pH. Results of a succeeding greenhouse study indicated that total K removal by one rice crop varies from 26 to 95 kg ha-1 depending on rice yield. Rice yield and total K removal by rice crop were higher in soil with higher fertility status. Harvest index of K was 21-25. This result indicated that returning rice straw into the land will return 75-79 of removed K back to the soil. Even if rice straw is applied in-situ apparent K balance is negative with the present rate of K fertiliser application in soils with higher rice yield potential. Application of higher rate of K fertiliser is needed in this soils to maintain the soil K status in the long run. Based on this review it can be concluded that K deficiency exists in Malaysian rice soils and K adsorption property of soils varies. These should be considered while applying K fertiliser in rice crop. Recycling rice straw can return at lease 75 of removed K back to the soil. Application of higher rate of K fertiliser is needed in soils with higher rice yield potential.
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Abstract
Investigation conducted at the Muda Irrigation Scheme Kedah showed that the exchangeable potassium K content in rice soils ranged from 0.08 to 0.44 cmol kg-1. Five out of sixteen soils studied were found deficient in K. A follow up adsorption study indicated that K adsorption varies among soils. Maximum K adsorption capacity calculated from Langmuir equation is higher in soil with higher pH. Results of a succeeding greenhouse study indicated that total K removal by one rice crop varies from 26 to 95 kg ha-1 depending on rice yield. Rice yield and total K removal by rice crop were higher in soil with higher fertility status. Harvest index of K was 21-25. This result indicated that returning rice straw into the land will return 75-79 of removed K back to the soil. Even if rice straw is applied in-situ apparent K balance is negative with the present rate of K fertiliser application in soils with higher rice yield potential. Application of higher rate of K fertiliser is needed in this soils to maintain the soil K status in the long run. Based on this review it can be concluded that K deficiency exists in Malaysian rice soils and K adsorption property of soils varies. These should be considered while applying K fertiliser in rice crop. Recycling rice straw can return at lease 75 of removed K back to the soil. Application of higher rate of K fertiliser is needed in soils with higher rice yield potential.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal S590.2 M239 2002 Call Number |
| AGROVOC Term: | POTASSIUM |
| AGROVOC Term: | RICE |
| AGROVOC Term: | RICE STRAW |
| AGROVOC Term: | RICE FIELDS |
| AGROVOC Term: | SOIL |
| AGROVOC Term: | PADDY SOIL |
| AGROVOC Term: | FERTILITY |
| AGROVOC Term: | MALAYSIA |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:26 |
| URI: | http://webagris.upm.edu.my/id/eprint/15539 |
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