Author(s): S. JENA, S. MAJI, S. BASU, PRAMITI. K. CHAKRABORTY, P. BANDOPADHYAY, R. NATH AND P. K.CHAKRABORTY

Abstract: Light transmission causes variation in light utilization under intercropping. To analyse the transmission of photosynthetically active radiation (PAR) in wheat-mustard intercropping, a two year experiment (2008-09 and 2009-10) with five treatments was conducted, (T₁ :sole wheat, T₂ -:sole mustard, T₃: two wheat: six mustard, T₄: four wheat: four 1 2 3 4 mustard and T₅: six wheat: two mustard) in a RBD with six replications in a 54 m2 plot. PAR was measured from 7:30 to 5 15:30 h by means of line quantum sensor at two hour interval. PAR transmission was maximum at 15:30 h throughout the growth phase in wheat and at 07:30 h in mustard. Mean transmission in T treatment was maximum (47.34 to 90.3%) 3 during mid phase of growth in wheat, sole mustard recorded maximum transmission. Sunlit leaf area index (L*) decreased significantly with the increment in transmission. About 74.6% variation in L* was explained by the variation of transmittance at 11:30 h in wheat.

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