Effects of Starter Fertilizer Applications and Placement and In-Furrow Applied Fungicides on Cotton Seedling Disease Development and Yields

G.L. Sciumbato and W.M. Ebelhar


 
ABSTRACT

A trial was designed to determine the effects of starter fertilizer (ammonium poly phosphate, 11-37-0, and urea, 46-0-0), starter fertilizer placement (surface vs in-furrow), and in-furrow fungicide treatment (none; Terraclor Super X, 12.5 g, 10 lb/A: Ridomil PC, 11 g, 10 lb/A) on cotton seedling stand and yield. Experimental design was a factorial RCB with four replications. Plots were inoculated at planting with 1.5 ml per row ft of Rhizoctonia solanii and Pythium spp. infested oats to increase disease pressure. The surface applied fertilizer was applied with a single #8003 nozzle tip over the row to give a total spray volume of 5 GPA and the in-furrow fertilizer was applied with a TX 12 nozzle tip. The application of either starter fertilizer or in-furrow fungicide significantly increased stand 18 and 35 days after planting. There were no significant differences in seedling stand counts between the two infurrow applied fungicides. Plots treated with the urea fertilizer had significantly lower seedling stand counts. The plots surface sprayed with foliar fertilizer had significantly higher seedling stand counts over the plots sprayed in-furrow. The only significant interaction was starter fertilizer x starter fertilizer placement. The urea nitrogen source was significantly more phytotoxic than the ammonium poly phosphate when they were applied in-furrow. None of the treatments significantly affected seed cotton yields.



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pg. 216
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
 
Document last modified Sunday, Dec 6 1998