Effect Of Time And Rate Of Nitrogen And Potassium Application On Seed Yield, Yield Component And Seed Germination Percent And Rate Of Onion (Allium Cepa L.cv.Texas Early Grano 502)
2007
Aminpour, R., Isfahan Agricultural and Natural Resources Research Center | Yahyaabadi, M., Isfahan Agricultural and Natural Resources Research Center | Gafari, A., Isfahan Agricultural and Natural Resources Research Center
In order to study the effects of rate and time of N and K fertilizers application on seed yield of onion (Allium cepa L. CV. Texas Early Grano 502), a factorial experiment based on RCBD with 4 replications was conducted 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: a1-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 six split application types of N and K on the base of plant growth stages, thus: b1- N applied, 1⁄2 at the planting time and 1⁄2 at the beginning of bolting and K applied at the planting time, b2- N and K applied, 1⁄2 at the planting time and 1⁄2 at the beginning of bolting, b3- N applied,at the beginning of bolting,at the pollination andat the grain filling and K applied at the planting time, b4- N applied, 1⁄4 at the planting time, 1⁄4 at the beginning of bolting, 1⁄4 at the middle of bolting and 1⁄4 at the grain filling and K applied, 1⁄2 at the planting time and 1⁄2 at the beginning of bolting, b5- N applied,at the beginning of bolting andat the grain filling and K applied at the planting time and b6- N applied,at the beginning of bolting andat the grain filling and K applied, 1⁄2 at the planting time and 1⁄2 at the beginning of bolting. Results showed that the seed yield (1018.3kg/ha) and capsules/umbel and seeds/capsule in a1 treatment were significantly higher than a2 and a3. Comparison of split application treatments showed that the seed yield (1120kg/ha), umbels/m2 and capsules/umbel in b4 treatment were significantly higher than the others. The levels of N and K fertilizers didnot have significant effects on seed germination percent and rate and comparison of split application treatments showed decreasing the seed germination percent in b3 treatment.
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