Sebastião Wilson Tivelli

Produtividade de beterraba em função de doses de sulfato de amônio em cobertura

No estado de Sao Paulo foram conduzidos, em duas localidades, tres experimentos de campo com a beterraba cultivar Top Tall Early Wonder com o objetivo de avaliar a producao total de raizes e parte aerea sob diferentes doses de N aplicadas em cobertura. O primeiro experimento foi realizado em Monte Alegre do Sul (SP) em um Argissolo Vermelho Amarelo distrofico e os dois ultimos foram instalados em Campinas (SP) em um Latossolo Vermelho Amarelo distrofico. Os tres experimentos foram conduzidos no delineamento de blocos casualizados com seis repeticoes. As doses de nitrogenio foram parceladas em duas aplicacoes, na forma de sulfato de amonio, e variaram de zero a 200 kg ha-1. No primeiro experimento a produtividade maxima de raizes de beterraba foi atingida com 92 kg de N ha-1 em cobertura, no segundo com 179 kg de N ha-1, e no ultimo experimento com 151 kg N ha-1. A produtividade da parte aerea em todos os experimentos foi linear e positiva. As maiores produtividades de beterraba para a comercializacao em macos (raizes e folhas) foram obtidas com a maior dose de N em cobertura, ou seja, 200 kg N ha-1. Foi encontrada uma relacao linear e positiva entre o teor de N das raizes e parte aerea com as doses de N aplicadas em cobertura.

Avaliação dos acessos de alho coleção do Instituto Agronômico de Campinas

Fifty accesses from the garlic germplasm bank of Instituto Agronomico de Campinas were evaluated in Tiete and Jundiai, Sao Paulo State, Brazil. The field trials were carried out in 2003, and the experimental design was randomized blocks with three replicates. The data were subjected to an ANOVA and the means compared using the Skott-Knott test at a 5% probability level. The access Piedade and Gigante de Curitibanos showed excellent performance for yield and bulb quality in both locations. On the other hand, environmental interaction occurred for access Bulbilho Aereo 2 and Andradas Manoel Lopes 2. For the first one, the bulb size was different and for the second the yield changed. A greater genetic diversity on yield and bulb diameter was observed in Jundiai, due to lower environmental effects.

Produtividade de cultivares de alho na região paulista de Tietê

The high cost of garlic seed and the refrigeration process may increase yield, but it is a barrier for small farmers who are responsible for the large Brazilian production. Therefore, research seeking low cost garlic seed, regionally made, and competition studies for yield between refrigerated and no refrigerated cultivars are fundamental. This work aimed to evaluate yield and bulb quality of four no refrigerated garlic varieties (Assai 3702, Gigante de Curitibanos, Santa Catarina Branco and Santa Catarina Roxo) and the refrigerated type Jonas (storage at 4o C for 40 days). The field trial was carried out during March-September 2005, in Tiete, Sao Paulo State, Brazil, in a randomized block design with five replications. Jonas, without differ from Santa Catarina Roxo, Santa Catarina Branco, and Assai 3702 produced higher yields (8.4; 7.6; 7.4 and 6.9 t.ha-1 respectively) and greater bulb weights (30.5; 27.0; 26.3 and 24.6 g respectively). For bulb diameter these four varieties were graded as type 4 (36-45mm), Gigante de Curitibanos was lower than Jonas concerning to yield and bulb mass.

Condutividade elétrica da solução nutritiva e espaçamento entre plantas na produção de beterraba e alface

Baby leaf market and production systems are beginning in Brazil. Some of the few hydroponically growers are adapting the nutrient film technique (NFT) system in their farms, however without the necessary knowledge, provided by research, for that. Thus, the aim of this research work was to evaluate the effect of electrical conductivity of nutrient solution and space between plants on table beet and lettuce for baby leaf production in NFT hydroponic system. Two independent experiments were carried out, from December 2011 to March 2012, with table beet and lettuce in a greenhouse of 126 m2, at Northeast Paulista field station of Paulista Agency of Agribusiness Technology in Mococa, Sao Paulo state, Brazil. The experimental design was a split plot with randomized blocks replicated four times. The main treatment was composed of different electrical conductivities of the nutrient solution (0.4, 0.8, 1.2 and 1.6 dS/m) and the secondary treatment consisted of different spacings between plants (2.5, 5.0 and 10.0 cm) for both species. Harvest was carried out when leaves of each specie reached length of approximate 15.0 cm. Higher yields of 5.5 and 3.1 kg/m2 were obtained with 1.6 and 1.4 dS/m for table beet and lettuce, respectively. The space between plants of 2.5 cm promoted greater yields of 4.2 and 4.9 kg/m2 for table beet and lettuce, respectively.

Desempenho do quiabeiro consorciado com adubos verdes eretos de porte baixo em dois sistemas de cultivo

To evaluate the agronomic viability of the intercropping okra crop (Abelmoschus esculentus) with small size and erect green manuring species Mucuna deeringiana and Crotalaria spectabilis, two experiments were carried out, one in conventional system at Monte Alegre do Sul, Sao Paulo state, Brazil, from February to July 2008 and one in an organic system at Sao Roque, Sao Paulo state, Brazil, from December 2008 to June 2009. The experimental design was randomized complete blocks, with five treatments and five replications. The five treatments were constituted by okra monoculture and okra intercropped with one or two lines of M. deeringiana and one or two lines of C.spectabilis in the seeded at the same time of the okra crop. In organic farming two new treatments were added to the experiment to evaluate the green manures in single cropping. Production, number of fruits per plant, fruit length and diameter and plant height were evaluated in okra plants and plant height and fresh matter weight were determined in the green manuring plants at different periods after seeding.. The evaluation of the efficiency of the consortium was measured by the ratio of area equivalent (RAE). Average yield per okra plant was 190.9 and 582.0 g plant-1, respectively, under conventional and organic cropping. The RAE was 1.5 and 1.6 in the consortium of okra with two rows of M. deeringiana and Crotalaria spectabilis, respectively. Intercropping erect short green manuring species with okra is agronomically viable and can be used by family farmers without interference with the yield of okra crop.

Produtividade de rúcula e tomate em função da adubação N e P orgânica e mineral

In order to compare different mineral and organic fertilizers, source of nitrogen and phosphorus, trials were conducted in protected environment at Instituto Agronomico, in Campinas (SP), Brazil, from October to November, 2004 with rocket salad and at Sao Joao Farm, in Elias Fausto (SP), Brazil, from September 2004 to February 2005 with tomato. The treatments on the rocket salad trial were: four rate of N (0; 50; 100; 150 kg ha-1 N) and four rate of P (0; 100; 200; 300 kg ha-1 P2O5) using the fertilizers MAP; DAP; hoof and horns flour (HHF) and bones flour (BF) at sowing and side dressing. Two experiments were conducted with tomato. Four rates of N on side dressing were studied (0; 133; 266; 399 kg ha-1 N) applying ammonium nitrate (AN) and HHF without change the rate of P at planting time. In a second trial, four rate of P were applied at planting time (0; 250; 500; 750 kg ha-1 P2O5) using triple superphosphate (TS) and BF without change of N (AN) rate on side dressing. The fertilization with 75 kg ha-1 N and 300 kg ha-1 P2O5 using MAP + DAP at planting time and 75 kg ha-1 N HHF on side dressing was the best treatment for rocket salad production. The organic fertilization with HHF was more efficacious when applied at planting time. The result showed that HHF was a better source of N than AN for tomato production and fruit average weight. The TS was a better source of P than the BF for tomato production.

Calagem em cultivos sucessivos de cenoura e alface

Amounts of lime recommended for carrots and lettuce have little experimental support for the amounts indicated. This research was developed to determine the adequate value of soil bases saturation (V) and pH (CaCl2) to obtain the best yield and commercial quality of carrot (winter) and lettuce (summer) cultivated on crop rotation system during three years. The experiment was carried out in Monte Alegre do Sul, Sao Paulo State, Brazil, on a Typic Kandaudult soil. The residual effect of liming, at the second and third years, was also evaluated. The treatments were: 0; 2; 4; 6 and 8 t ha-1 of lime on the first year; 4 and 8 t ha-1 of lime on the second and third years successively. As a result, the positive effects of liming on yield and commercial quality of carrot and lettuce were evident during the three years, and residual effect of liming in the second and third years was evident, too. In the first year, carrot yields were 24% to 39% higher than treatment without lime, while lettuce head average weight increased from 79% to 199%. The highest carrot yields were 46 t ha-1 obtained at V=73% and pH (CaCl2) = 5,7. The best commercial results for lettuce were reached with V between 72% and 80% and pH (CaCl2) between 5,5 and 5,6. The treatment with liming and without B, Cu, Mn and Zn presented lower carrot yield and commercial quality during three years.