Journal of Food, Agriculture and Environment

Impact of PAR interception at different time points on total dry matter production in rice (Oryza sativa L.) crop transplanted on different dates

Author(s):

Shrabani Basu ¹*, Srijani Maji ¹, Swaraj Kumar Dutta ², Sarika Jena ³, Rajib Nath ¹, Prodip Kumar Chakraborty ⁴

Recieved Date: 2014-05-20, Accepted Date: 2014-09-26

Abstract:

The main rice-growing season in Eastern India spans from July-October. The average productivity is low because of cloudiness during the season. Interception of photosynthetically active radiation (PAR) by the crop at the different time points of a day plays a significant role in biomass accumulation, which is ultimately translated into yield. The effect of radiation has been investigated but the impact of different time-point has not been discussed in the literatures. To identify the congenial time point for PAR interception, an experiment was carried out for two years (2007 and 2008) on rice [variety IET-4786 (Satabdi)], which was transplanted during a period of 1^st to 29^th July having one week interval. The experiment was conducted at the B.C.K.V Research Farm (22°56'N and 88°32'E) in a randomised block design with four replications having a plot size of 30 m². The PAR interception was measured at 7.30, 9.30, 11.30, 13.30 and 15.30 h during tillering, panicle initiation, flower emergence and 100% flowering stages. The total dry matter accumulation and leaf area index (LAI) were measured at these same growth stages. The mean interception was maximum at 100% flowering and minimum at the tillering stage; interception by the rice crop declined gradually after 15^th July transplanting. Maximum dry matter accumulation was observed at 100% flowering. About 88, 92,73 and 97% variations in dry matter accumulation were explained by PAR interception at 13.30 h under 1^st, 8^th, 22^nd and 29^th July transplanted rice; whereas, 73% variation in dry matter accumulation could be explained through the variation in interception of PAR under 15^th July transplanted crop. It was observed that the interception during early morning and afternoon played a significant role in biomass production. In case of late-planted crop, interception almost throughout the day played a regulatory role in dry matter production. The LAI increased gradually and the maximum LAI was recorded at 100% flowering. Delay in transplanting reduced the LAI. PAR interception increased significantly with the increment in LAI; the strength of relationship declined beyond 15^th July transplanting. The results suggested that the rice should not be transplanted beyond 15^th of July depending on PAR interception by the crop.

Keywords:

Dry matter, interception, tillering, panicle initiation, flower emergence, 100% flowering, PAR, planting dates, leaf area index, rice

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 3&4
Category: Agriculture
Pages: 285-291

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