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Evaluation of T. Aman and Boro Rice Under Double Transplanting as Influenced by Age of First Planted Crop in Boro-fallow-t. Aman Cropping Pattern

Md Saiful Alam Talukder
Senior Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur

M. Ibrahim
Senior Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur

Abhijit Saha,
Principal Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur

M.A. Quddus
Chief Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute Gazipur

Abstract/ Executive Summary:

During T. Aman at double transplanting on September 20 with tillers of 30 days old crop which was 1st time transplanted with 25 days old seedlings produced maximum (4.71 t/ha) grain yield. At Boro, double transplanting on February 20 with tillers of 35 days old crop which was 1st time transplanted with 40 days old seedling produced maximum grain yield (6.56 t/ha).

Keywords: Double transplanting, Aged seedling, Boro-Fallow-T. Aman cropping pattern

Location: BRRI farm, Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Farming System

Commodity: Rice

Objectives:

(i) To evaluate the performance of double transplanted Aman and Boro rice with tillers of different ages of first planted crop and direct transplanting of aged seedlings on the same day in Boro-Fallow-T. Aman cropping pattern and (ii) To determine optimum seedling age in the seed bed to be used for double transplanting

Methodology:

The study was conducted at BRRI experimental farm, Gazipur during T. Aman 2008 and Boro 2008-09 seasons. The design of the experiment was RCB with three replications. In T. Aman season the treatments were: T1- Double transplanting (first transplanting of 25-day old seedlings & 2nd transplanting with tillers of 40-day old crop of 1st planting);T2- Transplanting with 65 days old seedlings;T3- Double transplanting (first transplanting of 25-day old seedlings & 2nd transplanting with tillers of 30-day old crop of 1st planting);T4- Transplanting with 55 days old seedlings;T5- Double transplanting (first transplanting of 25-day old seedlings & 2nd transplanting with tillers of 20-day old crop of 1st planting);T6- Transplanting with 45 days old seedlings; and T7- Delayed transplanting of 25 days old seedlings. In Boro, T1- Double transplanting (first transplanting of 40-day old seedlings & 2nd transplanting with tillers of 45-day old crop of 1st planting);T2- Transplanting with 85 days old seedlings; T3- Double transplanting (first transplanting of 40-day old seedlings & 2nd transplanting with tillers of 35-day old crop of 1st planting);T4- Transplanting with 75 days old seedlings;T5- Double transplanting (first transplanting of 40-day old seedlings & 2nd transplanting with tillers of 25-day old crop of 1st planting);T6- Transplanting with 65 days old seedlings; T7-Delayed transplanting of 40 days old seedlings were included. In T. Aman and Boro seasons the transplanting in main fields were done on 20 September 2008 and 20 February 2009, respectively. Seeding dates were synchronized according to treatments. BRRI dhan31 and BRRI dhan29 were grown in T. Aman and Boro season, respectively. In 1st transplanted plot, 12-15 seedlings/hill were planted at a spacing of 10x10 cm. One third amount of recommended fertilizer was used in T. Aman and Boro seasons for first transplanted plot.

Source of Information: Proceedings of the BRRI Annual Internal Research Review, 2008-09

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

During T. Aman season, grain yield, panicle number/m2 and filled grain per panicle were significantly different. Double transplanted with 30 (T3) days old crop of 1st transplanted gave maximum yield (4.71 t/ha) which was comparable to tillers of 40 and 20 days old crop of 1st transplanting(T1) but significantly higher than other treatments . Delayed transplanting with 25 days old seedlings gave significantly the lowest grain yield (3.57 t/ha). Grain yield under traditional transplanting was found to improve with decreasing seedling age. Higher grain yield in double transplanted rice was closely associated with higher number of panicle per sq. m. and higher number of filled grains per panicle. The grain weight was not affected by age of seedlings. Grain yield, panicle number/m2 and filled grains/panicle were significantly different in Boro season. Significantly the highest grain yield was obtained from DT (T3) with tillers of 35-day old crop of 1st transplanting (6.56 t/ha) followed by double transplanting (T5) with tillers of 25-day (6.16 t/ha) old crops of 1st transplanting. Significantly the lowest grain yield was observed from delayed transplanting of 45 days old seedlings (4.80) which was comparable to traditional transplanting of 85 days old seedlings. Probable reason to have higher grain yield in case of double transplanted rice was due to higher number of panicles/m2 and higher number of filled grains per panicle. Results suggested that in T. Aman, double transplanting with tillers of thirty (30) days aged seedling of 1st transplanting having 25 days in seedbed produced maximum (4.71 t/ha) grain yield while in Boro, double transplanting with tillers of thirty (35) days aged seedling of 1st transplanting remaining 40 days in seed bed produced maximum (6.56 t/ha) grain yield. The results are agreed with earlier findings that double transplanting has proved advantageous over traditional transplanting under delayed situation.

Knowledge Management: Report/Proceedings