Desarrollo y evaluacion tecnica de una maquina sembradora-abonadora manual.
1991
Villalobos L Enrique | Hetz H Edmundo | Cabezas A Fernando
A manually operated seed-cum-fertilizer drill was developed, manufactured and technically evaluated. Its construction is rather simple and the more important elements are common bicycle parts; the devices most difficult to manufacture are the slotted vertical discs to meter the seed and the fertilizer metering screw. The drill was evaluated in the laboratory and in the field using seeds of peas, asparagus, beans, lentils, maize, rape and wheat; the fertilizing system was evaluated using diammonium phosphate, potassium sulfate and triple superphosphate. The best results were obtained in maize with 70% of well placed seeds and 0% of seeding failure; a good performance was also obtained with wheat. The worst results were obtained in lentils and asparagus with only 30% of well placed seeds, because an specific disc was not built for them. Seeding depth and fertilizer placement was highly acceptable in all trials. An average work capacity of 0.075 ha/hr. (13.33 hr/ha) was measured. More works is needed in order to study manufacturing in a large scale, costs to the user, adaptation to animal traction, area to work with one machine considering the requirements of the different crops and the socio-economic conditions of the small farmers.
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