Pedro Henrique Monnerat

COMPOSIÇÃO MINERAL DE GRÃOS DE TRIGO SUBMETIDOS A DOSES DE SULFATO DE AMÔNIO E TRINEXAPAC-ETIL

Grain mineral composition is important for the establishment of appropriate fertilizer levels, as well as to define the nutritional quality of food and physiological quality of seeds. The objective of this study was to evaluate the effect of ammonium sulfate (AS) and trinexapac-ethyl rates on mineral composition of wheat grains ( Triticum aestivum L.) cv. Pioneiro. The experiment was carried out in Vicosa, Minas Gerais State, Brazil, from June to October 2006. The treatments consisted of five AS rates (150 kg ha -1 , 300 kg ha -1 , 450 kg ha -1 , 600 kg ha -1 , and 750 kg ha -1 ) combined with four trinexapac-ethyl rates (0 g ha -1 , 62.5 g ha -1 , 125 g ha -1 , and 187.5 g ha -1 ). The experiment was arranged in a randomized block design with four replications. AS rates increased the concentrations of total-N (protein), Ca, S, Cu, and Zn and decreased the concentrations of P, K, and Mn (at AS rates above 457 kg ha -1 ). The Mg and Fe concentrations were not influenced by AS rates. Trinexapac-ethyl increased total-N, P, and Mn; reduced Ca; and had no influence on the concentrations of K, S, Cu, Zn, Mg, and Fe. It can be concluded that AS application improves the nutritional quality of grains, while the use of the growth retardant trinexapac-ethyl has no influence on its mineral composition. KEY-WORDS: Triticum aestivum L.; nutrition; growth retardant.

Adubação potássica aplicada na axila foliar e no solo em coqueiro anão verde

Potassium (K) directly influences the productivity of coconut dwarf to be activator of enzymes involved in respiration and photosynthesis, among other functions. However in many cases their implementation on the ground has not provided adequate leaf levels. It was evaluated the influence of doses of KCl applied via soil and via leaf axil on the leaf nutrient concentration in green dwarf coconut tree (Cocos nucifera L.). The experiment was driven at a commercial orchard in Campos dos Goytacazes, Brazil, in a Typic Quartzipsamments, in the period from May 31, 2007 to May 31, 2008, using a randomized complete block design with five treatments and sixteen replicates. Treatments consisted of two application ways (on soil and on the axil of the leaf number nine) and two levels of KCl (1666 and 3333 g of KCl per plant, per year) level 1 and 2 for soil and (833 and 1666 g per plant, per year) level 1 and 2 in for plant axil, with three month interval applications), besides a control, without KCl. Leaf samples were collected before the first fertilization and three months after each fertilization. Application of KCl increased leaf concentrations of K and Cl and it reduced Mg concentration in plant tissue. Leaf concentrations of N; P; Ca; S; B; Cu; Fe; Mn and Zn were not influenced by treatments. Potassium application in the frond axils is an alternative due to better absorption of nutrients compared to conventional fertilization. In addition, frond axils fertilization minimizes loss of nutrients and it is possible to reduce the amounts of potassium applied.

Toxicity symptoms of nickel in common bean

Despite the importance of nickel (Ni) in the N metabolism of legumes, common bean (Phaseolus vulgaris L.) is considered very sensitive to Ni doses. The objective in this study was to characterize the toxicity symptoms of Ni in common bean cv. Perola. The experiment was conducted in greenhouse in the campus of the Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes - RJ. Solutions containing 0; 20; 40; 60 and 100 mg L -1 of Ni, in the form of nickel chloride hexahydrate (NiCl 2 .6H 2 O), were applied to shoots of common bean plants at the rate of 2.5 mL of solution per plant of common bean, 25 days after sowing. Plants of common bean treated with 0; 20; 40 and 60 mg L -1 of Ni sh owed no toxicity symptoms. Plants treated with 100 mg L -1 of Ni sh owed chlorotic leaves with

Produção de massa seca e teores de nutrientes do feijoeiro comum submetido à deriva de glyphosate em duas classes de solo

, a deriva de glyphosate pode atingir ate 160m alem do local considerado alvo colocando em risco as culturas vizinhas. Assim, o objetivo deste trabalho foiavaliar a materia seca e os teores de nutrientes do feijoeiro comum (Phaseolus vulgaris L.) cv. Perola submetidoa deriva de glyphosate. O experimento foi conduzido em casa de vegetacao na Universidade Estadual do NorteFluminense Darcy Ribeiro - UENF, Campos dos Goytacazes - RJ, utilizando o feijoeiro comum. Utilizou-se odelineamento em blocos casualizados em esquema fatorial 4 x 2 com quatro repeticoes, sendo o primeiro fatorconstituido pelas subdoses de 0; 14,4; 43,2 e 86,4g ha