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Gujarat Agricultural University (1995)

DYNAMIC MODELING OF DAILY WATER USE BY SUMMER PEARL MILLET ’ (Pennisetum americanum L.)

Bodapati, Papuji Rao

Titre : DYNAMIC MODELING OF DAILY WATER USE BY SUMMER PEARL MILLET ’ (Pennisetum americanum L.)

Auteur : Bodapati, Papuji Rao

Université de soutenance : Gujarat Agricultural University

Grade : Doctor of Philosophy (Ph. D) Agricultural Meteorology 1995

Résumé
Crop water use is a complex function of the climatic conditions, stage of the crop development and the soil water content. Models have been developed earlier using various approaches and levels of details to improve the prediction of evapotranspiration. Functional models with some empiricism can be used for routine applications than the mechanistic models. Transpiration from the pearl millet was found to be strongly influenced by leaf area than by stomatal conductance. Field experiments during the summer season of the years 1994 and 1995 were conducted with pearl millet cv. GHB-30. The experiments were laid out in split-plot design, with three dates of sowing as the main plot and four irrigation levels as the sub-plot treatments which were replicated four times. The results obtained in this investigation revealed that, air temperature had a profound influence on the growth and development of summer pearl millet. The optimum date of sowing was found to be February 15th , which would provide optimum environmental conditions for the growth and development of the crop. Different dates of sowing did not show any significant effect on the grain yield. Irrigating the crop at 25% depletion of available soil moisture gave the highest grain and biomass yields but its WUE was lower than that for the other irrigation levels. Pearl millet required about 310 GDD in summer season to build considerable GLAI and about 800 GDD to attain the maximum GLAI. A second-order polynomial was developed for estimating GLAI using the accumulated GDD. The FAO Kc, values had over-estimated ET rates and a second-order polynomial was developed to estimate daily Kc values from the accumulated GDD for non-stressed pearl millet.

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