Influence of bedsoil upon of soil-bearing seedling in the IRRI manual transplante

Thein Mya U

Date

1983

Abstract

If the seedlings for the mechanical rice transplanter have low sowing rate and are of older age, than those now commonly used, the good physical quality and favorable physiological properties of seedlings would result in good overall performance of the transplanter. The field duration of rice plants would be shortened giving away for an increased cropping intensity. Abnormal weather conditions when plants are still young could be less damaging at the nursery bed where protective measures could be done more easily than in the field. In mechanical transplanting, proper leaf stage, seedlings per hill and plant height are three major requirements. The number of seedlings per hill was affected by sowing rates whereas plant height and leaf stage was affected by bedsoil management. To obtain short plant height at old seedling age, the field experiment with four kinds of soil management, namely, uniform of mixture of carbonized rice husk and original soil in equal volume; 5 cm thickness layer of carbonized husk over original soil; plastic sheet covered on original soil and original soil without any treatment for control, was conducted using IR-36 and IR-42 rice varieties. No fertilizer was used in all soil treatments. Based on the three transplanter requirements, the optimum sowing rate of 100 g/m^2 for 30-day-old seedlings was obtained by carbonized husk treatment on both IR-36 and IR-42. The bed-soil management using carbonized husk in layer was easy to prepare and required less effort in cutting the seedling from the seedbed.

Document Type

Master Thesis

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1983 A2 T44

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