استجابة نمو و حاصل صنفين من القطن للكثافة النباتية و مواعيد إضافة السماد النتروجيني

Abstract EN

The study was conducted to investigate the effecte of two cultivars,Lachata and Coker 310, two plant densities 20, 30 cm between each plant and three application dates of nitrogen fertilizer (first date: half recommended at sowing and half at boll formation stage.

Second date: half recommended at sowing and half after 30 days from sowing.

Third date: quarter recommended at sowing and half after 30 days and quarter at boll formation stage) on growth properties, yield and yield components.

The study included a field experiment in summer season 2005 at Alshirqat location (150 km north Tikrit city).

The randomized complete block design(RCBD) with three replications was used The results showed that cultivar Coker 310 was significantly superior compared with Lachata in the plant height, while the Lachata variety was significantly superior in boll weight charcter.

Plant sown at densities of 30 cm were significantly higher at plant height , number of vegetative and sympodia branches /plant, the total number of boll / plant as compared of those plant sown at 20 cm.The height plant was significantly higher at first application dates of nitrogen,where as the total yield weight and lint yield was significantly higher in third application date .