Book Description

With the objective of clarify the effect of row spacing and plant density over the yield of irrigated wheat a experiment were conducted at the Cerrado Research Center (CPAC) experimental field. The trial was planted in May and harvested in September, 1985. The experimental design was a split plot in a complete randomized blocks with 4 replications where plant density were the main plot and row-spacing the sub-plot. The treatments were composed by the combination of the three plant density (200, 300 and 400 viable seed per m2) and by three row spacing (0.17 x 0. 17 cm, 0.17 x 0.34 cm and 0.34cm in between rows). The cultivar used was BR 12-Aruana and the equipment of irrigation utilized was the Central Pivot. The experiment was instaled in dark red latosol and the fertilization was at rate of 20, 100 and 60kg/ha of N, P and K applied at sowing time plus 60 Kg/ha of N as a side dressing. No interaction were found between plant density and row-spacing. The effect of row spacing and plant density were shown on tables 1 and 2 respectively. The row-spacing effect were not significant over the hectoleter weight, thousand Kernel weight, number of Kernel/spike and plant height. The row-spacing 0.17 x 0.17 increased significantly the yield per area the number of spikes per m2, the number of tiller per plant, the number of heads per plant and number of tiller per m2. The plant densities were not significant over the yield/area, hectoliter weight, thousand Kernel weight, number of heads/m2, plant height and tillers number/m2. The plant density of 200 viable seeds/m2 had a positive effect over the Kernels/spike, tillers/plant, heads/plant and over tillers surviving %. The overall yield mean of the experiment was 5.584 kg/ha. This was the year of a 3 years experiment at differents spots of Cerrado Region. The number of cultivars will increased and shanged as needed.