Efeitos de lâminas totais de água e de épocas de plantio sobre a produtividade, o açúcar total recuperável e os atributos qualitativos da cana-de-açúcar

• Autor(a) principal: Pereira, áureo Rodrigues
• Data de Publicação: 2012
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/738
• topic: Lâmina total de água; Irrigação; Cana-de-açucar; Water depths; Irrigation; Cane sugar; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

The object of this work was to evaluate the effects of total water slides and planting epochs in the number of stems in phases, growth stages and maturity of the cane plant, variation SP911049, for productivity, in tons of cane per industrial hectare (Know as TCH), total recoverable sugar per hectare (ATRha-1), as well as qualitative attributes of sugar cane. The experiments were conducted in different planting periods, May and August 2010, in a randomized block design (DBC) with five treatments: T1 - without irrigation, T2 water depths corresponding to 40% of total necessary irrigation (ITN) , T3 - 70% ITN, T4 - 100% ITN and T5 - 130% ITN and 5 reputations. To calculate the total water depths applied in each treatment, an ITN was figured taking into consideration the effective rainfall during the experimental period. The treatments well represent the increase in total water depth, representing of 169 and 151 t ha-1 of sugar cane (TCH), and 25 and 21.5 Tha-1 ATR, for the said planting in May and August 2010, respectively. The irrigation did not alter the attributing qualities of the sugar cane for the two periods of planting which were studied. No differences were found in averages of stem dimensions for the varying water depths during the periods studied, resulting in an average stem size of 1.624,9 per 2.009,8 grams, with an average water depth of 934 mm for 1.561 mm, for the planting period in May. However, some differences were found during the planting study conducted in August. The average stem dimensions, in August, increased from 196,4 to 231 cm, with an average water depth of 921 for 1.258 mm, for an increase of 18%. The planting in May did not show significant differences between the plantings. The number of stems of sugar cane per hectare during the May plantings ranged from 71,346 to 84,216, with the average water depth ranging from 934 mm to 1.561 mm, increasing 18%. In August the number of stems of sugar cane per hectare obtained was 108,023 per total water depth of 1.189,38 mm, increasing 37% in relation to treatments without irrigation. For the three growth phases of sugar cane evaluated during the two planting periods, a variation of total water depth was found to be more important during the growth stage. The increase of water depths in proportion to the stages of industrial production of stalks as to Total Recoverable Sugar for the sugar cane plantings studied in My and August, 2010, resulted in the best being obtained for the planting in May, talking into consideration the fact that we did not see much variation in the sugar cane in regards to the variations of irrigated water depths. Proportional increments of irrigation of 44,5% and 44% in industrial production of the plants and 56% and 35% in Total Recoverable Sugar for plantings of sugar cane during May and August, 2010, respectively, in relation to treatment without irrigation supplemented.