Influence of Nitrogen and Boron Interaction on Cotton Production
Sep 12, 2018
Studies across the cotton (Gossypium hirsutum L.) growing regions of the United States have shown boron and nitrogen to be essential nutrients for profitable cotton production. Four levels of nitrogen (N) (0, 34, 67, and 101 kg/ha for 1996 and 0, 67, 101, and 135 kg/ha for 1997) and four levels of boron (B) (0, 0.56, 1.12, and 2.24 kg/ha) were used on DPL-50 in a split-plot design with B subplot treatments randomly assigned within N whole plot treatments. The treatments were replicated four times. Nitrogen as sodium nitrate and ammonium nitrate for 1996 and 1997, respectively, were side-dressed and boron was foliarly applied as solubor. Yield parameters were measured for each treatment. There was no N X B interaction so data were averaged over N and B rates, respectively. In both years, increased N rate up to 101 kg/ha N increased lint yield (P < 0.01). The increase in lint yield for 1996 was 96, 369 and 455 kg/ha for 34, 67, and 101 kg/ha N over the untreated control, respectively. In 1997, however, the only significant yield increase was observed for the 101 kg/ha N rate. For both years, the maximum yield was achieved with 101 kg/ha N and 0.56 kg/ha B rates. Adding foliar boron at 2.24 kg/ha, however, decreased lint yield over the untreated control. Leaf blade tissue level increased with increasing B rates compared with the initial B level. Additional research is needed to fully understand the benefit of B in N utilization.