Abstract
ABSTRACT Yield and disease incidence were evaluated in potato (Solanum tuberosum, cv. Atlantic) after six years of cultivation in succession with corn (Zea mays, cv. ‘AG 6080’) under conventional tillage (CT, depth of tillage: 20 cm) or in succession with three grass species [Guinea grass (Panicum maximum, cv. Tanzânia), Palisade grass (Brachiaria brizantha, cv. Marandu) and corn] under deep tillage (DT, depth of tillage: 70 cm). Total tuber yield was higher in DT in average 36% the value obtained in CT (17.76 t/ha), with no effect of the grass species. Common scab (Streptomyces scabies) incidence was influenced by treatments, the highest (16.9%) and the lowest (9.5%) values being obtained in succession with corn and Guinea grass, respectively, both under DT. The lowest incidence of tuber greening at field (2.58%) was also recorded in Guinea DT, significantly lower than obtained in Corn CT (6.33%), possibly due to a more efficient ridging operation. Grass species showed different values of aboveground dry biomass production. Guinea grass (26.56 t/ha) was the most and Corn under CT and DT (5.72 and 5.56 t/ha, respectively, without ears) were the least productive ones. Soil density, macroporosity and resistance to penetration indices were significantly better with DT, the grass species affecting them in a minor degree. The deep tillage system is, therefore, recommended for potato cultivation regardless the grass species used for crop succession.
Highlights
Atributos do solo e da cultura da batata em preparo profundo de solo e sucessão com poáceas
A produtividade total em tubérculos para os tratamentos em Deep Tillage (DT) foi, em média, 36% maior em relação ao conventional tillage’ (CT) (17,76 t/ha), não havendo efeito da poácea cultivada em sucessão
Other indirect losses as consequence of compaction can occur to the potato crop, such as those related to poor drainage, generating favorable environment to the incidence of diseases by waterlogging
Summary
Atributos do solo e da cultura da batata em preparo profundo de solo e sucessão com poáceas. A incidência mais baixa de esverdeamento de tubérculos em campo (2,58%) foi também obtida para sucessão com capim Tanzânia sob DT, significativamente inferior ao valor obtido em milho CT (6,33%), possivelmente devido à maior eficácia da operação de amontoa. Other indirect losses as consequence of compaction can occur to the potato crop, such as those related to poor drainage, generating favorable environment to the incidence of diseases by waterlogging. In this sense, a number of reports associating root rot with soil compaction are found in scientific literature (Ragassi et al, 2011)
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