Quality Rice Seed

Quality Rice Seed

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Production of Rice Seed in Upland Environments btn_backbtn_forward
Fertilizer management
Understand the effect of fertilizer on seed production and be able to calculate fertilizer doses.
The most common limiting nutrients for rice are nitrogen (N), phosphorus (P), potassium (K), sulfur (S), and zinc (Zn).

Principles of fertilizer application:

  • Variety: Long duration variety needs more fertilizer than shorter duration variety.
  • Soil: Light soil needs more split application of N and K compare to heavy soil.

Fertilizer should be applied based on a soil test and the desired  yield. The farmer should strive to obtain a fertilizer recommendation based on analysis of soil samples. This table serves as a guide.

When a soil test is not possible, general recommendations can be a good guide to applying fertilizer based on local recommendation.

  • P and K fertilizer application: The best is at final harrowing just before seeding.
  • N fertilizer application: Nitrogen is the most limiting factor in rice production. However, in seed production, judicial application of N fertilizer is  important since excess N facilitates vigorous plant growth that increases disease and insect infestation and delays fruiting resulting in a poor quality seed:
    • For every ton of yield required, 15 - 20 kg N is needed.
    • Apply in 2-3 splits.
    • Use more splits for longer duration cultivars.
    • Apply the first top dressing at the onset of tillering (21 days after seeding) and just after first weeding.
    • Apply a second top dressing at about panicle initiation - between 45–50 days after seeding.
    • Broadcast uniformly over the soil surface.
    • Don’t apply more than 30-35 kg N ha-1 in a single split to minimize loss.
    • Use basal N only when it is necessary. Soils with high mineral releasing potential, e. g. Savanna soil, basal N may not be necessary
    • Use a Leaf Color Chart to estimate N need.

Because leaf color is affected by the sun, always shade the leaf being measured with your body. The same person should take the readings and at the same time of the day.

Click here to view the calculation of the actual amount of fertilizer (urea, TSP, MP, Gypsum or Zinc Sulphate) from the nutrient dose of NPKSZn.

Next lesson That completes this module - next you will have an opportunity to check your understanding of what you have studied. btn_backbtn_forward
Last Updated on Wednesday, 03 October 2012 12:06  

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