Vol. 7 No. 1
Diurnal variation in spectral properties of wheat crop sown under different dates.
Author(s): M. PARYA, S. K. DUTTA, S. JENA, R. NATH AND P. K. CHAKRABORTY
Abstract: Spectral properties of crop are important indicators regarding the pattern of absorption, interception and reflection by the crop; diurnal variation is also important to understand the veracity of the process. The results suggested that, delayed sowing decreased the absorption of PAR by the wheat crop; reduction was more during flowering than the vegetative phase. Depression of absorption was noted during early hours of the day. Interception was found to be maximum at 11:30 h. It was observed that delayed sown wheat intercepted more PAR during flowering and milking stages which led to the increase of leaf temperature of wheat. Diurnal variation in reflection of photosynthetically active radiation (PAR) showed a gradual decline from 7:30 h to 11:30 h and then an increase at 13:30 h. Reflectivity of crop increased from CRI to milk stage; delayed sown crop reflected more amount of PAR.
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