Nitrogen and potassium application by fertigation at different watermelon planting densities

The effects on the production of 'Top Gun' watermelons were evaluated at N and K (N+K 2 O) doses via fertigation of 79.8+106.7,106.4+142.2,133.0+177.7,and 159.6+213.2kg ha -1 and at plant spacings of 0.5, 1.0, 1.5, and 2.0 m.The experiment had a split-plot randomised block design with three replicates.N+K 2 O doses and plant spacings were randomised in the plots and subplots, respectively.We evaluated foliar N and K contents, average mass of commercial fruits (MF), total (FT) and commercial (FC) number of fruits, and total (PT) and commercial (PC) productivity of weight classes 6-8, 8-10, 10-12, and >12 kg per area and plant.The N+K 2 O doses only influenced the foliar K content.The other variables were not influenced by the interaction of factors or by the N+K 2 O doses.Plant spacing influenced fruit number and production.Reducing plant spacing from 2.0 to 0.5 m decreased MF, FT, FC, PT, and PC of the classes per plant but increased FT, FC, PT, and PC of the 6-8 and 8-10 kg classes per area.