Le polyculteur Porte-outils a traction animale a roues

Le polyculteur est une machine polyvalente destmee a effectuer des operations culturales et a permettre le transport dans les regions ou les animaux de trait represented la principale source d'energie. II permet de realiser presque toutes les operations qu'effectue un tracteur, offrant ainsi, a un plus grand nombre d'agriculteurs, une souplesse et une precision de travail qui n'etaient jusqu'alors qu'a la portee de quelques exploitants. Concue en premier lieu pour la traction bovine, cette machine est egalement adaptee a d'autres types d'attelage dont les buffles. les chevaux, les mulets et les chameaux

Development of Rolling-Type Soil Crust Breaker

Soil crusting or capping is a serious problem in arid and semiarid regions; it restricts the emergence of crop seedlings. A mechanical, rolling soil crust breaker was designed, developed, and tested in the field. The equipment is of simple construction and breaks the soil crust over the rows of germinated seeds effectively, improving emergence significantly without any damage to seedlings. It can be manually operated as a single-row unit or a multiple row unit and can be pulled by animal draft power or a small tracto

Soil crust and its impact on crop establishment: A review

Soil crusting is a worldwide problem occurring under a wide range of soil and climatic conditions. Soil crusts affect seedling emergence and reduce the infiltration rate causing loss of water and crop yield. Considerable research has been done in order to understand the process of crust formation and the factors affecting it. Soil crust strength and impedance to seedling emergence have been studied in detail and measures to avoid crusting and methods to ameliorate its adverse effects have been suggested. The findings of such studies are summarized in this paper

A technical evaluation of improved animal drawn implements under on-farm conditions

Animals are a major source of agriculture power in India and animal drawn implements have evolved to a high degree of simplicity and perfection over a long period of time..

Age determination of Paleogene sediments from the Prysz Bay

Age dating of Paleogene diamictites from ODP Site 739 in Prydz Bay with marine microfossils (diatoms and calcareous nannofossils) suggests the build-up of a major East Antarctic ice shield in latest Eocene to earliest Oligocene time, about 35-38 m.y. ago. Strontium isotopic analyses of small mollusk remains found within these diamictites, however, yield younger ages ranging from 29 to 23 Ma (i.e., latest early Oligocene to earliest Miocene). These age discrepancies could be caused by repeated glacial reworking of microfossils, macrofossils, and sediment clasts through the late Oligocene or, alternatively, by ion exchange in the still aragonitic mollusk shells