Dry-seeding establishment method for rainfed rice

Issue Date

7-1999

Abstract

Successful establishment of rainfed rice can increase the productivity in rice-based cropping system. Early planting by dry-seeding could save rice from water stress and ensure adequate moisture for a second crop. However, dry-seeding is not readily adopted by farmers because of the heavy weed infestation after the rice has germinated. The objective of this study was to determine the influence of three establishment and weed control methods on rice dry matter yield (DMY), grain yield and weed population under rainfed condition. Experiments were conducted at CLSU in Muñoz, Nueva Ecija and MMSU in Batac, Ilocos Norte. Three rice establishment methods (drill dry-seeding, drum dry-seeding, and drum wet-seeding) and three weed control treatments (use of herbicide, handweeding, and no weed control) were tested.

Yield of PSB Rc14 was highest (about 2-3 t/ha) when drum wet seeded. Yields with weed control treatments were similarly high. Dry seeding of rice coupled with weed control by herbicides or handweeding, resulted in a yield of about 1-2 t/ha. However, without weed control, yield of dry-seeded rice was almost zero. Handweeding and herbicide application lowered the grass population at 60 DAT when rice was dry-seeded. Competition of weeds and rice was reflected in the DMY. With handweeding, PSB Rc14 produced higher DMY than without weed control. Application of herbicide in drill dry-seeded rice lowered DMY at early growth stages but at harvest, DMY was similar to that where handweeding was done.

Aside from better weed control supplementary irrigation, bunding to store the water, and application of fertilizers are needed to realize high rice yields in rainfed areas.

Source or Periodical Title

Philippine Agricultural Scientist, The (Formerly: The Philippine Agriculturist)

ISSN

0031-7454

Volume

82

Issue

3

Page

260-267

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

quarterly

Physical Description

graphs ; tables ; references

Language

English

En – AGROVOC descriptors

RICE; ORYZA; SOWING; DIRECT SOWING; SEEDBED PREPARATION; RAINFED FARMING; SEED DRILLING; WET SEEDING; WEED CONTROL

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