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Accueil du site → Doctorat → États-Unis → 1982 → THE DETERMINANTS OF KHARIF FALLOWING ON THE VERTISOLS IN SEMI-ARID TROPICAL INDIA

University of Minnesota (1982)

THE DETERMINANTS OF KHARIF FALLOWING ON THE VERTISOLS IN SEMI-ARID TROPICAL INDIA

MICHAELS, GREGORY HUGH

Titre : THE DETERMINANTS OF KHARIF FALLOWING ON THE VERTISOLS IN SEMI-ARID TROPICAL INDIA

Auteur : MICHAELS, GREGORY HUGH

Université de soutenance : University of Minnesota

Grade : Doctor of Philosophy (PhD) 1982

Résumé
The practice of cultivated monsoon fallowing is prevalent in large tracts of Vertisol soils in the Indian semi-arid tropics. Dry-season crops are grown on residual soil moisture. In an area where rainfall is generally considered a critical constraint on agricultural production, a practice that results in low rainfall productivities and high rates of erosion must be questioned. The purpose of this research was to provide documentation on the determinants of monsoon fallowing. This documentation is provided for three states in the Indian semi-arid tropics : Andhra Pradesh, Madhya Pradesh and Maharashtra. Variation in the practice of monsoon fallowing was explained across districts, across individual farms, and across individual plots. Four approaches were used : Cross-section district-level data was analyzed using generalized least-squares regression techniques. Cross-section farm-level data was analyzed using weighted and two-stage least squares procedures. Logit analysis was done on plot data. Finally, a non-sequential discrete stochastic linear programming model was specified and solved for a representative farm-household in the "wet" kharif fallow are of Madhya Pradesh. Results from each phase of the analysis were generally mutually reinforcing. The perception of two distinct categories of monsoon fallow noted in previous literature was corroborated by this work. "Dry" monsoon fallowing occurs where rainfall is too precarious to ensure a monsoon crop, but requires an endowment of soils with sufficient moisture-holding capacity to store residual moisture for a successful post-rainy season crop. "Wet" monsoon fallow occurs in areas endowed with deep Vertisols and adequate to excessive rainfall. The deep Vertisols enable a successful dry season crop, while rainfall is sufficiently heavy to make a monsoon crop risky from the standpoint of flooding and waterlogging. Interactions between soil moisture-holding capacity, rainfall and irrigation intensity, and the coefficient of rainfall variation had the strongest power in explaining variation in monsoon fallowing. Although many plots are confined to rabi cropping activities purely from the standpoint of agroclimatic factors, there were cases where physical plot characteristics could not entirely explain the actual kharif cropping status observed.

Mots clés : Agronomy, Agricultural economics, Social sciences, Biological sciences

Accès au document : Proquest Dissertations & Theses

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