Resposta da batata cv. Cupido à fertilização organomineral

Potato crop cycle is relatively short and presents high yield per area; therefore, it is a very demanding culture for available nutrients in the soil solution. Despite its importance and the large number of studies about the crop, there is little research on plant nutrition regarding the use of organomineral fertilizer. This study evaluated potato, cv. Cupid, development and productivity as a function of fertilization with pelletized organomineral fertilizer. The experiment was done in Perdizes, Minas Gerais, in the rainy season of 2014/2015. The experimental design was a randomized blocks, with factorial arrangement of 4 x 2 (doses x management) and a control with mineral fertilizer, with 3 repetitions. Organomineral fertilizer doses were 25, 50, 75 and 100% of the conventional mineral dose, which was 600 kg ha-1 K2SO4, 850 kg ha-1 NH4H2PO4, and 300 kg ha-1 (NH4)2SO4 of topdressing 19 days after planting (DAP). Fertilization managements were with or without topdressing at 19 DAP, when the potato was hilled. Two plants per plot were sampled at 36, 50, 64 and 81 DAP and analyzed for leaf, stem and dry matter contents. DRIS - Diagnosis and Recommendation Integrated System was applied at 36 DAP and the potatoes were harvested 112 DAP and subjected to tuber classification. Throughout the cycle, stem, leaf and tuber dry mass showed no significant differences between the fertilization managements. The doses of organomineral fertilizer and topdressing management does not affect productivity, and the lower doses (25%) were similar the greater ones and the control, with an average of 16.8 t ha-1, demonstrating that it is viable to make a single application of organomineral fertilizer at planting due to operational efficiency. The low yields observed were due to high rainfall and temperature, creating favorable conditions for the incidence of pests and diseases. According to DRIS, the organomineral dose 75% for topdressing, presented the best nutritional balance.

O produtor familiar na pecuária leiteira : limites e potencialidades

The technological change is nowadays, comprehended as a playing field which involves cultural and economic processes of appreciation and depreciation of the social aspects of family unit. The exclusion of small producers from the activity is used as an argument to characterize that in the contemporary intercapitalist competition, the family ways of production take up restrict social positions of a technical progress and of a cultural and economic appreciation. The state, a coparcener of the modernization process, has its relevance as a financing agent, a technical capacitor, an infrastructure propitiator, that is, through macro and microeconomic policies which can create sustainable conditions to permit, mainly, not only the family producer to be inserted in the activity, but, above all, to remain in it. This way, this study aims to identify and analyze the family producer, through its limits and potentialities, with a thesis that this would be the main agent responsible for boosting the Brazilian milk production in quantity and quality. Therefore, results were compared obtained from a field survey with data collection via semi-structured open interviews in a sample of 108 producers effectively respondents, namely: 59 family farmers with active DAP (research focus) and 49 employers producers the municipality of Monte Alegre de Minas - MG. Technological indices were used to identify the developmental stage of the producers, thus allowing a comparative study between them. The field research covered all rural municipality of Monte Alegre de Minas – MG and, the result found that the majority of family farmers presented lower rates than technological employers producers. However, it allowed us to state also that the producer family and assisted by public policies, can be the agent of transformation of dairy farming.