FraÃÃes nitrogenadas em linhagens de feijoeiro submetidas a doses e fontes de nitrogÃnio e suas relaÃÃes com a produtividade de grÃos / Fractions nitrogen in bean plant lineages submitted the nitrogen doses and sources and its relations with the productivity of grains

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The present study aimed at to evaluate the answer of bean plant lineages to different nitrogen doses and sources and also to study the fractions nitrogen and your relationship with the grain productivity. They were evaluated 16 bean plant lineages (Phaseolus vulgaris L.) classified with relationship to the answer the nitrogen manuring in responsive (RC-I-3, CV-78, OP-NS-331, CNFC8055, RC-I-7, MA-I-18.13, ESAL 630 and PÃrola) and not responsive (Ouro Negro, TalismÃ, VC-5, LH-10, MA-I-2.5, Z-22, VI4899C and CNFE 8017) cultivated in Ijaci and Patos de Minas-MG in Red-Yellow Latosol. The used experimental delineation was triple lattice 4x4. In each place seven different and contiguous experiments were installed involving two sources of nitrogen urea (45% N) and ammonium sulfate (20% N) and four doses of the nutrient (0, 60, 120, 240 kg ha-1 of N). For occasion of the sowing it used the formulated 0-20-20 of N, P2O5 and K2O in the dose of 400 kg ha-1. The doses of N were parceled. It was applied 1/3 in the sowing and remaining in coverage 20 days after the emergency of the plants (DAE) except for the dose 240 kg ha-1 of N which for being elevated it opted for applying 1/3 in the first coverage 20 DAE and 1/3 in the second coverage 27 DAE. The coverage was made of conventional form manual in continuous lines sidelong to the plant and followed by irrigation. The portions were constituted by two lines of two meters in length spaced 50 cm with density of seeds for lineal meter to the depth 3-4 cm. At the time of the bloom collected leaf samples for the determination of the nitrogen fractions (Nitrate, N soluble organic, N soluble and N insoluble) and total N in the leaf. For occasion of the crop allied the determination of the productivity of the grains samples were collected for the determination of total N in the grains. The data obtained in each place were submitted to the analysis of individual variance involving the nitrogen doses and sources. Soon after it made the joint analysis of the two place. The doses effect was decomposed for each source and within each source. With medium data they accomplished the analyses of lineal regression to be considered the answer of the lineages to the application of doses N and the averages comparasion tests for grains productivity and for the nitrogen fractions among bean plant lineages. To lineage Ouro Negro introduced the biggest grains productivity (2529 kg ha-1) while CV-78 introduced for productivity minor (1776 kg ha-1). However to cultivate Ouro Negro introduced one of the smaller contents of N in the grains and of the nitrogen fractions in the leaves. As opposed lineage CV-78 which introduce one of the largest content of the nitrogen fractions. The nitrate fraction constituted nitrogen fraction minor met in the leaves of the bean lineages while the N insoluble constitutes the biggest nitrogen fraction. The ammonium sulfate promoted the biggest grains productivity, nitrate content and N insoluble when compared with the urea. The grains productivity and the content of these nitrogen fractions were larger in the dose of 240 kg ha-1 of N. The bean lineages cultivated under doses and sources of N in Ijaci-MG introduced the biggest grains productivity and contents nitrogen superior fractions to Patos de Minas-MG. In general, itÂs infers that contents of the nitrogen fractions in the leaves bean linages did not introduce directly related with grains productivity.

ASSUNTO(S)

agronomia

ACESSO AO ARTIGO

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