Management of nitrogen stress in cotton by using greenseeker technology

This study was carried out with GreenSeeker technology to determine the possibility of nitrogen stress management in cotton and to determine the differences between NDVI value and nitrogen doses determined with GreenSeeker, to determine the nitrogen deficiency and stress conditions by making use of NDVI value in cotton production and to intervene when necessary and to direct the producers in this regard. The study was conducted at Siirt University Faculty of Agriculture Department of Field Crops experimental area as randomized complete block design with four replications in 2018. MAY 344 cotton variety was used as plant material. Six different nitrogen doses (0, 6, 12, 18, 24 and 30 kg da-1 N) including control were used. The results showed that there were significant differences between different N applications for leaf chlorophyll content (SPAD reading), NDVI value of boll formation period (NDVI-2), number of boll, seed cotton yield and fiber lint, but there were non significant differences in terms of leaf area, NDVI value of flowering period (NDVI-1), plant height, node number of first fruiting branches, number of monopodial branch, number of sympodial branch, number of nodes, height / node ratio, boll weight, seed cotton weight of single boll and ginning percentage. There were non-significant differences obtained in terms of observed lint quality characteristics except fiber strength. In the study, the highest seed cotton and lint yield obtained from 18 and 12 kg da-1 N doses, the highest leaf chlorophyll content value (SPAD reading) and number of boll obtained from 12 kg da-1 N doses. The highest NDVI-2 values obtained from 12, 24 and 30 kg da-1 N doses, respectively. There were non significant differences between N doses for NDVI-1 values of flowering periods but significant differences observed for NDVI-2 values of boll formation periods. The finding obtained from this research indicated that leaf chlorophyll content (SPAD reading) and NDVI-2 (NDVI value of boll formation period) can be used for determining N doses differences in cotton production.