Agronomic characteristics and silage production of sweet potato clones / CARACTERÃSTICAS AGRONÃMICAS E PRODUÃÃO DE SILAGEM DE CLONES DE BATATA-DOCE
AUTOR(ES)
JoÃo Aguilar Massaroto
DATA DE PUBLICAÇÃO
2008
RESUMO
Two assays were developed to evaluate sweet potato clones to yield, root quality, silage yield and quality and resistance to the root-knot nematode Meloidogyne incognita race 1, in the municipality of Ijaci, Minas Gerais State, Brazil. In the first assay, twenty accessions from a breeding program from the state of Tocantins, Brazil, together with five commercial cultivars (BrazlÃndia Branca, BrazlÃndia Rosada, BrazlÃndia Roxa, Canuanà e Palmas) were evaluated. The experiment was carried out from February to August of 2006, in open field, in randomized blocks design, with three replicates and sixteen plants each parcel. Roots were evaluated for total yield, average weight, commercial yield, average commercial weight, form and resistance to soil insects. Aerial part was evaluated for total fresh matter yield, dry matter content, dry matter yield and crude protein yield. The silage of each clone was evaluated for pH values, dry matter content, and contents of crude protein, neutral detergent fiber, mineral matter and ether extract in percentage of dry matter. The cultivar Palmas and the accession UFT-48 showed to be good options for double purpose tillage, aiming commercialization of in natura roots and use of the aerial part for animal feeding. Accessions UFT-52 and UFT-112 showed to be good options for double purpose tillage too, however, roots able industrial processing. Accession UFT-22 was indicated only for in natura roots commercialization, while accessions UFT-02-AL, UFT-09-AL e UFT-115 were indicated only for roots tillage for industrial processing. Accession UFT-10-AL showed to be good option only for animal feeding. The second assay evaluated the resistance to the root-knot nematode Meloidogyne incognita race 1 of fifteen accessions from breeding program from the state of Tocantins, thirty clones from breeding program from the state of Minas Gerais, together with five commercial cultivars (BrazlÃndia Branca, BrazlÃndia Rosada, BrazlÃndia Roxa, Canuanà e Palmas). The experiment was carried out from February to June of 2006, under greenhouse conditions, in completely randomized design. Stems of each genotype were planted in polystyrene trays filled with commercial substrate PlantmaxÂ. Seventeen days after planting, nematode egg were inoculated, in a proportion of 30 eggs mL-1 of substrate. Ninety days after inoculation, the stems were collected, their radicular systems washed and colored for accounting of egg-masses index. Cultivars BrazlÃndia Branca and Palmas were used as control for susceptible and resistant genotypes, respectively. It was observed variability among and within germoplasm collections. Thirteen genotypes presented high resistance to the root-knot nematode, six originating from Tocantins State and seven from Minas Gerais State. Thirteen accessions presented resistance, while sixteen presented moderate resistance, being able to be used as supplementary germoplasm to this characteristic. Only three accessions were susceptible to the root-knot nematode. The cultivar BrazlÃndia presented moderate resistance, being against results of susceptibility showed in scientific literacy.
ASSUNTO(S)
soil insects form batata-doce nematodes fitotecnia produÃÃo de silagem agronÃmicas form fitotecnia nematodes batata-doce soil insects produÃÃo de silagem ipomoea batatas ipomoea batatas agronÃmicas
