Year: 2008
Type: article
Abstract: The effects of P and K on grapevines (Vitis vinifera L.) var.Muscat Rosada were evaluated four years, considering the same levels of N. The experiment was conducted at the Vicuña Experimental Station (30° S; 70°44´ W) of the Instituto de Investigaciones Agropecuarias (INIA).The soil is alluvial antropic miscellaneous (Entisols).Three fertilization treatments were established: 1) N 160 + P 2 O 5 200 + K 2 O 300; 2) N 160 + P 2 O 5 0 + K 2 O 300; and 3) N 160 + P 2 O 5 200 + K 2 O 0. At the beginning of the experiment, grape vines received all the phosphate fertilizers, 200 kg ha -1 of P 2 O 5 as triple superphosphate in Treatments 1 and 3. Nitrogen was applied as urea for four years.The applications were initiated when the vine buds measured 20 cm.The K was applied to the soils of Treatments 1 and 2, at a dosage of 200 kg ha -1 K 2 O, using potassium sulphate.Between berry set and 30 d before harvest, 100 kg ha -1 K 2 O were applied as potassium sulphate by fertigation.Significant effects of the P fertilization were observed by the second year, with increased cluster numbers per plant.K also increased grape fruit yield by the third year.This response was obtained with less than 5 mg kg -1 of P available in the soil and less than 145 mg kg -1 of exchangeable K in the soil.The initially low content of available K and P suggests a high probability of response to the application of both elements.
Authors: Carlos Sierra B, Rubén Alfaro P
Institution: Instituto de Investigaciones Agropecuarias
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W1968449011