Adalberto Santi

Effect of organic material on the production and characteristics of lettuce cultivars

Lettuce cultivars cultivated under greenhouse were evaluated with the application of cattle manure mixed to sawdust in Alta Floresta, Mato Grosso State, Brazil. The experimental design was randomized blocks in a factorial scheme with 12 treatments and four replications. The treatments consisted of combinations of six cultivars (Lucy Brown, Great Lakes, Isabela, Vera, Elisa and Baba de Verao) and two sources of organic material - cattle manure (100%) and cattle manure mixed to sawdust (50% manure + 50% sawdust composte) - applied at the level of 10 L m-2. Plots measured 1.2 x 1.2 m with 16 plants spaced by 0.3 m over the useful area. Samples were constituted by the four central plants in each plot. Application of bovine manure mixed to sawdust reduced fresh mass, stem length, plant diameter, commercial leaf number and total leaf number when compared to the application of pure manure. Although the cultivars Elisa and Baba de Verao presented higher total and commercial leaf number, it did not reflect in higher commercial mass. The cultivar Lucy Brown presented the highest commercial fresh mass.

Desempenho agronômico de alface americana fertilizada com torta de filtro em ambiente protegido

This work was carried out at the Mato Grosso State University, Tangara da Serra campus, Brazil, aiming to evaluate the agronomic characteristics of crisphead lettuce cultivars depending on filter cake rates application in protected environment. We used a randomized blocks design in a 3x4 factorial scheme, composed by three cultivars (Julia, Taina and Rafaela) and four rates (0, 10, 20 and 40 t ha-1), with four replications. Plots size was 1.2x1.2 m with 16 plants spaced 30x30 cm each, among which the 4 central plants were evaluated. We assessed the total fresh mass, marketable fresh mass, head fresh mass, total leaf number, marketable leaf number, stem length, stem diameter and plant diameter. The cultivar Rafaela presented the highest performance for fresh mass total, marketable and head, at the filter cake rate of 20 t ha-1. The cultivars Julia and Rafaela had greater plant diameter, stem diameter, total leaf number and marketable leaf number than cultivar Taina, regardless the filter cake rate applied. The filter cake application provided higher yield and marketable quality for crisphead lettuce.

Deficiências de macronutrientes em sorgo

A procura de informacoes sobre sorgo tem aumentado e parece estar associada ao seu maior potencial produtivo, maior resistencia ao deficit hidrico, o surgimento de novas cultivares e expansao do seu cultivo na regiao do Cerrado. Com base nisso, objetivou-se com o presente trabalho verificar os sintomas tipicos e individualizados de deficiencia nutricional de macronutrientes na cultura do sorgo, mediante a observacao dos efeitos da omissao de nutrientes no desenvolvimento das plantas e avaliar os efeitos dessas omissoes na composicao mineral do sorgo. Foram cultivadas plantas de sorgo em solucao nutritiva completa de Sarruge (1975), submetidas aos seguintes tratamentos: omissao de N, P, K, Ca, Mg e S. Aos dois dias apos o inicio do ensaio, as plantas apresentaram os primeiros indicios de deficiencia, que foram descritos e caracterizados. Quando os sintomas estavam definidos as plantas foram coletadas, lavadas, separadas em folhas, colmo e raizes, colocadas para secar, para posterior determinacao de massa seca, area foliar e teores de macronutrientes. Os sintomas visuais de deficiencia de nutrientes mostraram-se de uma maneira geral facilmente caracterizaveis. A producao de massa seca foi afetada pela omissao de nutrientes e os tratamentos que mais afetaram as diferentes partes das plantas e as areas foliares foram as omissoes de nitrogenio, calcio e magnesio. O acumulo de nutrientes pelas plantas obedeceu a seguinte ordem decrescente: N>K>Ca>Mg>P>S.

Desempenho e orientação do crescimento do pepino japonês em ambiente protegido

The production of the Japanese cucumber Tsuyataro was evaluated using methods of stems growth conduction, controlling the lateral buds and number of stems per plant, through pruning. The research was carried out from October to December 2010, in a protected environment in Tangara da Serra, Mato Grosso state, Brazil, using a randomized blocks design, with five replications, in a factorial scheme (2x3). The first factor was the pruning, i.e., removal or not of lateral stems and the second factor was constituted of the control of number of stems: one, two and three stems per plant, with five replications. We evaluated the following characteristics: total and marketable number of fruits, commercial fruits rate, fruit length, fruit diameter, fruit length/diameter ratio, total and marketable yield of fruit per plant and fruit average weight. The treatment with conduction of the main stem without removal of lateral buds had better performance on total and marketable number of fruits per plant (19.4 and 16.0) and higher total and marketable yield of fruits (4,235.8 and 3,438.3 g per plant). The pruning of lateral buds provided increase in length, diameter and average mass of cucumber fruits of 24.5 to 25.1 cm; 3.4 to 3.5 cm and 212.1 to 228.3 g per fruit, respectively.