Análise de crescimento na cultura da batata submetida a diferentes lâminas de irrigação

Abstract

Conduziu-se um experimento na Fazenda São Manoel, localizada em São Manuel, SP, pertencente à Faculdade de Ciências Agronômicas da Universidade Estadual Paulista, com o objetivo de avaliar os efeitos de diferentes lâminas de irrigação no crescimento da cultura da batata (Solanum tuberosum ssp. tuberosum), cultivar Aracy. O ensaio foi instalado em um Latossolo Vermelho-Escuro, textura arenosa, sob uma cobertura de plástico. O delineamento experimental utilizado foi o de blocos ao acaso, com cinco tratamentos, cinco coletas de plantas para fins de análise de crescimento, e quatro repetições. Os tratamentos consistiam em irrigar a batata quando a tensão da água no solo atingia 15, 35, 55, 75 e 1.500 kPa. O aumento nas lâminas de irrigação induz incremento no índice de área foliar, na duração da área foliar, na taxa de crescimento relativo e na taxa assimilatória líquida.

Water Depletion Depth for Irrigation of Potato Cultivar Ágata

“…Lower irrigation frequencies led to a decreased in vegetative development, leading to reductions in dry matter accumulation. This result agrees with that found by Aguiar Netto et al (2000), who determined that greater soil drying between consecutive irrigations reduces physiological indices of potato growth.…”

“…A statistical significance was observed in a quadratic regression model with a maximum point at 3.63 for a depletion depth of 18.67mm (Figure 3). In this study, the mean IAF was close to that observed by Aguiar Netto et al (2000) who verified an IAF of 3.50 for cultivar Aracy and also agrees with Wang et al (2011) who demonstrated that LAI is rapidly affected by water deficiency. Kar & Kumar (2007), studying potato cultivation, observed a positive effect of soil water availability on LAI and SDM of plants, demonstrating the importance of establishing crop responses to available water in the soil.…”

“…Dry soils may generate losses by lowering plant turgor pressure, and consequently reducing shoot cellular expansion and growth, plants also tend to decrease the production of new leaves (Wang et al, 2011;Barnaby et al, 2015). In addition, there is an interference with photosynthesis and reduction of normal metabolic processes in plants, which generates stress and interfere significantly with vegetative development (Bezerra et al, 1998, Aguiar Netto et al, 2000.…”

“…In very humid soils, the availability of oxygen in roots decreases, impairing absorption and interfering with normal plant metabolism (Ahmadi et al, 2013), reducing SDM and productivity (Aguiar Netto et al, 2000). In this sense, cultivation in places with high precipitation rates such as the case of Guarapuava, where annual precipitation is generally above 1700 mm (Wagner et al, 2009), requires that producers have more information about crop management and irrigation systems in order to avoid excess or deficit of water supplementation, as long as crop losses may occur due to both deficit (Barnaby et al (2015) and excess water in the soil (Ahmadi et al (2017).…”

Functional growth analysis of diploid potato cultivars (Solanum phureja Juz. et Buk.)

“…De Oliveira et al (2000) also recorded high RGR values in cultivar Aracy at the start of the cycle, with a gradual decrease. In this cultivar, the maximum values fluctuated between 0.15 and 0.25 g g -1 d -1 .…”