These are rice seedlings planted in planting trays, put in basin, submerged. I apply foliar fert 18:18:18 + TE once every 2 days and also granule fert 20:10:10 + TE once. I notice after the 1st leaf dry up, the 2nd leaf which becomes dark green, rolled up (the whole leaf become like a needle) followed by browning from tip, then the whole leaf dry up in just a few days. The subsequent leaves, 3rd til 5th leaf looked ok. Can anyone help to identify the problem?
Really appreciate any help/advises!
Potassium (K) is an essential plant nutrient that improves root growth and plant vigor, helps prevent lodging and enhances crop resistance to pests and diseases. Potassium is mobile in the plant and quite mobile in the soil.
Potassium deficiency in rice is more common under the following crop management practices:
- excessive use of Nitrogen (N) or N and P fertilizers with insufficient K application
- direct seeded rice during early growth stages, when the plant population is large and root system is shallow
- cultivar differences in susceptibility to K deficiency and response to K fertilizer.
- K deficiency occurs in intensively cropped areas with high levels of N and P application. K is often deficient in coarse-textured/sandy soils; acid upland soils; degraded lowland soils; acid sulfate soils; and, organic soils
You must apply the fertilizer analysis.
It sounds like you're using too much fertilizer. You may experience this problem because of in excess of nitrogen and phosphorus. But more nitrogen can cause this problem. You shouldn't be giving so much fertilizer. You should have done some fertilizer analysis first. And if you're necessary, you should fertilize those it.
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