تأثير هيئة ومستوى النتروجين المضاف في العلاقة بين مستوى التراكم النتراتي وبعض صفات (Allium cepa L.)‎ محصول البصل الأخضر

Abstract EN

The experiment was conducted in Babylon Governorate during the growth season 2006-2007 to study the effect of three types of nitrogen fertilizers: urea, ammonium sulphate and calcium nitrate added in five levels each 0, 60, 120, 180 and 240 kg N/ha on some yield parameters of green onion "White Local" variety.

Treatments were distributed in Split-plot experiment and conducted in completely randomized block design (RCBD) with three replicates.

Duncan multiple range test was used to compare between means with probability level of 0.05.

The results showed that urea fertilizer was significantly superior and gave high number and length of leaves.

Ammonium sulphate fertilizer produced higher onion wet weight, higher protein percentage and higher soluble sugars in leaves and bulbs, while calcium nitrate fertilizer significantly superior in nitrate accumulation in leaves bulbs.

Experiments showed significant effects of nitrogen level.

Nitrogen fertilizer at level of 240 kg N/ha gave the highest length and number in leaves and nitrate accumulation in leaves and bulbs, while the level 180 kg N/ha gave the highest wet weight of bulbs and highest protein percentage in leaves and bulbs, and the level 120 kg N/ha gave the highest percentage of soluble sugars in leaves and bulbs.