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Effect of Shading on Yield of Main Rice Crop and the Following Ratoon Crop

M. A. Quddus
RFS
RFS Division, BRRI, Gazipur

J. W. pendleton
-
Multiple Cropping Department, IRRI, GPO Box No-933, Manila, Philippines

Abstract/ Executive Summary:

Effects of shading on the yield of IR5 and on its relationship was studied at the IRRI Farm, wet season. Shading at different growth stages reduced the grain yield of the main crop. Other yield components of the main crop were not significantly affected. Shading the main crop from flowering to 7 DAH had a significant effect on grain yield of the ratoon crop, Shading reduced the the yield of the ratoon crop by about 72%. Irrespective of growth stages shaded plots had a higher percentage of missing hills than nonshaded plots. Yield components and other plant characters were not significantly affected by different treatments.

Keywords: Shading effect, main rice crop, and ratoon crop

Location: IRRI Farm, Los-Banois, Philippines

Start Date: 30-06-1980

End Date: 30-11-1980

Program Area: Farming System

Commodity: Rice

Objectives:

To investigate whether shading on the main crop has an effect on the ratoonability as well as yield of the ratoon rice

Methodology:

The experiment was conducted at the IRRI Farm, Los-Banois, Philippines during wet season. The experiment was laid out in randomized complete design with three replications. Four shading crop treatments along with control (shading at flowering to 7 DAH (days after harvesting), shading at LMS (late milk stage) to 7 DAH, shading at harvest to 7 DAH, shading at LMS to 7 DAH + 30 kg N/ha as broadcast at EMS (early milk stage) and shading at flowering to 7 DAH + 30 kg N/ha applied as spray application at EMS) were used in this experiment.Seedlings of IR50 were raised in a dapog seedbed and transplant when twelve days old at the rate of two to three seedlings per hill (25 cmx25 cm). Basally, a fertilizer of 30-30-30 kg N, P₂O₅ and K₂O/ha has broadcast and incorporated with a comb harrow a day before transplanting. Thirty kg N/ha was applied at active tillering and panicle initiation stage respectively. An additional dose of 30 kg N/ha was applied to the main crop according to different treatments as mentioned earlier. Nylon musquito net was used as a shading materials. To measure the incident solar radiation inside and outside musquito net, photolluminator was used. Just one day after providing the nylon net light was recorded 5 times in each treatments and their average was expressed in percent basis. About 21% of incident light was recorded at the plant canopy with this kind of net. The net were removed from the field 7 days after harvesting the main crop. The main crop was cut at 15 cm height from ground level. Two days after harvesting the main crops, a single dose of 40 kg N/ha was applied to the ratoon crop. In main crops, weeds were controlled by hand weeding. To protect the crops from insect and pests, carbofuran at the rate of 0.5 a.i./ha was broadcast and incorporated during the last puddling.Subsequent applications were made at the rate of 1.0 a.i. at 10, 25, 40 and 55 days after transplanting.A sampling area of 5 m² was used to determine yields of both main and ratoon crops. The yield of clean rough rice was expressed in (t/ha) adjusted to m14% moisture content. Yield component samples were taken from twelve randomly selected hills. Number of panicles per hill, filled grains per panicle and 100-grain weight of both main and ratoon crops were also computed.

Source of Information: Bangladesh Rice J. 2(1 & 2): 79-82, 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Artificial shading of the main crops at different growth stages reduced grain yield of the main crop. Among different shading treatments, shading at milk stage of the main crop produced higher ratoon yield than shading at flowering stage. This suggests that lower accumulation of carbohydrate in the stubble and roots of the main crop with more number of days subjected to shading resulted in less number of panicles per hill and subsequently reduced the yield. The result further implies that shading on the main crop had little or no beneficial effects on the following ratoon rice.

Knowledge Management: Journal