Effect of time and rate of nitrogen and potassium application on seed quality and quantity of onion (Allium cepa L.cv.Texas Early Grano 502)
2004
Amin Pur, Reza | Yahya Abadi,Mojtaba | Pashnam, Rasul
In order to studying effects of rate and time of N and K application on seed yield of onion(Allium cepa L. CV. Texas Early Grano 502) , an experiment was conducted based on Factorial with a randomized complete block design and four replications at Kabootar Abad Research Station of Isfahan during two years( 2000-2002 growing seasons). The first factor was three rates of N and K including: a.-N and K recommended (on the base of soil test) , a2-35% more than recommended , a3-35% less than recommended and the second factor was 6 time treatments ofN and K application on the base of plant growth stages. The results showed that the seed yield and capsules/umbel and seeds/capsule in a, treatment were significantly higher than az and a3. Also comparison of time treatments showed that application of N at the 4 stages (planting time, beginning of bolting, middle of bolting and grain filling) and K application at two stages (planting time and beginning of bolting) led to increasing of seed yield, urnbels/rrr and capsules/umbel. Rates .of Nand K didn't have significant effects on Percent of seed germination but comparison of time treatments showed that application of N at the 3 stages (beginning of bolting, pollination and grain filling) and K application at planting time stage led to decreasing of Percent of seed germination. Key words: Onion, Seed yield, Nitrogen, Potassium, Seed Germination.
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