Journal of Food, Agriculture and Environment

Vol 12, Issue 3&4,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255

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


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


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 1st to 29th 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 15th 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 1st, 8th, 22nd and 29th July transplanted rice; whereas, 73% variation in dry matter accumulation could be explained through the variation in interception of PAR under 15th 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 15th July transplanting. The results suggested that the rice should not be transplanted beyond 15th of July depending on PAR interception by the crop.


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

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

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