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Intrusão radicular em irrigação localizada subsuperficial na cana-de-açúcar

2014; Volume: 8; Issue: 6 Linguagem: Inglês

10.7127/rbai.v8n600258

1982-7679

Fernando Nobre Cunha, Nelmício Furtado da Silva, Marconi Batista Teixeira, José Joaquim de Carvalho, Luciana Minervina de Freitas Moura, Camylla Vieira Sousa,

Plant nutrient uptake and metabolism

Currently few studies are conducted on evaluation of methods to quantify the field the presence of root intrusion for that control measures can be taken at the right time and consequently reducing productivity losses.Given the above, the aim of this work was to evaluate the occurrence of root intrusion in cultivation of sugar cane irrigated by subsurface drip irrigation under field conditions. The experiment was conducted at the experimental station of the Instituto Federal Goiano– Campus Rio Verde – GO. The plots had three grooves in double line spacing of 1.8 m between rows drippers, 0.4 m between rows and 8 m long. The cultivated variety is the RB 85-5453. The experimental design was a randomized block with four replications. The treatments consisted of five levels of replacement water (100, 75, 50, and 25%). The driplinewas buried at 0.20 m depth from the soil surface, in the middle of the double line. Were demarcated 16 drippers for monitoring irrigation, expressing the values of flow in L h-1, the evaluations were performed every 25 days for a total of 10 ratings.The root intrusionindex was generated from the relationship between flow calibration, measured in the laboratory (1 L h-1) and the residual flow determined by the volume of water collected during five minutes. Theroot intrusion index, variation coefficient, and degree of clogging decreases with increasing replacement waterand the uniformity coefficient inversely distribution increases with increasing replacement water.