Submitted by MATEUS MARRAFON NICOLOSI null (mateusmarrafon@hotmail.com) on 2016-03-09T17:15:05Z No. of bitstreams: 1 tese mateus corrigida.pdf: 1191062 bytes, checksum: efa8f3366ba79c8f17a0b252e084409a (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-03-10T17:27:46Z (GMT) No. of bitstreams: 1 nicolosi_mm_dr_jabo.pdf: 1191062 bytes, checksum: efa8f3366ba79c8f17a0b252e084409a (MD5) / Made available in DSpace on 2016-03-10T17:27:46Z (GMT). No. of bitstreams: 1 nicolosi_mm_dr_jabo.pdf: 1191062 bytes, checksum: efa8f3366ba79c8f17a0b252e084409a (MD5) Previous issue date: 2016-02-04 / O A agricultura familiar é responsável por 50% da produção de milho no Brasil. Esse sistema produtivo possui uma carência de máquinas agrícolas. Para atender a demanda e facilitar o processo de semeadura desses agricultores o trabalho tem objetivo de desenvolver uma semeadora de tração animal e avaliar um novo conceito do sistema de semeadura em fita, comparando com uma semeadora de tração animal já existente no mercado e com seu sistema de semeadura. O trabalho foi desenvolvido na safra 2013/2014 e 2014/2015 com a cultura do milho, no câmpus do Centro Universitário Moura Lacerda na cidade de Ribeirão Preto- SP. As variáveis avaliadas foram a profundidade da semente no sulco de plantio, distância longitudinal entre as plantas, comprimento da inserção da espiga, diâmetro do colmo e massa de grãos. Para avaliar a qualidade da operação foi realizado o controle estatístico por meio de carta de controle, utilizando o minitab. Após essa avaliação e analise dos dados o processo de semeadura da semeadora de fita de tração animal apresentou resultados mais estáveis do que a o processo de semeadura da semeadora de tração animal tradicional. / The family agriculture is responsible for 50% of the maize production in Brazil. This production system has a shortage of agricultural machinery. To meet the demand and facilitate the process of sowing of these farmers work's goal of developing a sower of animal traction and evaluate a new concept of seeding system to tape, comparing with a sower of existing animal traction in the market and with its seeding system. The work was developed on crop 2013/2014 and 2014/2015 with the culture of corn, on the campus of the Centro Universitário Moura Lacerda in the city of RibeirãoSP. The variables evaluated were seed in the furrow depth of planting, longitudinal distance between plants, insert Tenon length, culm diameter and mass of grain. To assess the quality of the operation was carried out by means of statistical control chart control, using the minitab. After this evaluation and analysis of data the process of seeding the sower of animal traction tape showed results more stable than the process of seeding the sower of animal traction.

Equidistant, uniform seed placement is important in lettuce production as seeds are densely planted within the row, typically only about 5 cm apart. When seeds are sown too close together, it is time consuming to thin seedlings to the desired plant spacing of 20 to 30 cm by hand and very difficult to do mechanically. The overall goal of the project was to improve lettuce seed placement accuracy and reduce the percentage of seeds spaced closely together. Specific objectives were: 1) to compare vacuum and belt-type planters to determine which style of planter provides better planting performance, 2) to evaluate belt planter seeding performance with different types of furrow openers, and 3) to develop practical modifications for vacuum planters to improve lettuce seed placement accuracy. Three vacuum planter configurations, an unmodified and two reduced seed drop height designs and a belt planter equipped with two types of furrow openers were tested in situ with pelleted lettuce seed at four travel speeds ranging from 1.6 to 4.0 kph. Belt planter performance was significantly better than that of the vacuum planter. Vacuum and belt planters both provided acceptable levels of performance at speeds below 2.4 kph, but at higher speeds, seed placement accuracy declined rapidly. No differences in planter performance were found between the two belt planter configurations tested. The mid-level drop height vacuum planter configuration had significantly better seed placement precision and fewer closely spaced seed spacings as compared to the unmodified vacuum planter. These findings illustrate the significant effect planter type, travel speed, and drop height have on planter performance. They also contradict the common perception that vacuum planters deliver seed more precisely and with fewer closely-spaced seeds as compared to belt planters. Further study is needed to determine the extent to which planter performance affects hand thinning labor costs, automated machine performance, final plant stand uniformity, and crop yield.