Response of some sugar beet (beta vulgaris l. )‎ cultivars to organic manure and mineral fertilizers under sandy calcareous soil condition at South South-Egypt

الملخص EN

This study was conducted during two successive seasons (2018/2019 and 2019/2020) to study the effect of different rates of organic manure (0, 10, 20 m³ha^-1) and different rates of mineral nitrogen (142 and 285 kg N ha^-1) on four species of sugar beet cultivars, i.

e.

, Casiopia (T₁), Salama (T₂), Sahar (T₃) and Faten (T₄).

The quality and nutrient contents of the four sugar beet species which grown in sandy calcareous soil.

The design of experiment is split-split plots, where the main plots were assigned to 3 rates of organic manure, 2 levels of N fertilizer as the sub-plots and 4 cultivars of sugar beet were arranged to random as sub-sub plots.

The results showed the highest yield of roots and top fresh weight (69.8 and 19.8 ton ha^-1) was obtained under addition 20 m³ha^-1 organic manure + 285 kg N ha^-1 with Salama and/or Faten cultivars in the means of 1^st and 2^nd seasons.

Also, the highest N, P, K uptake and sucrose yield of roots was obtained under fertilization with (20 m³ organic manure + 285 kg N ha^-1 with Salama cultivar).

While the highest P and K uptake of foliage was obtained with (20 m³ organic manure + 285 kg N ha^-1+ Faten and/or Sahar cultivars).

Also, data showed that studied treatments improve some soil properties and increase soil content of available N, P and K nutrients.

Increasing of organic matter and decrease CaCO₃% with increasing organic manure application, while increasing application of N lead to a slight effect on both CaCO₃ (% ) and organic matter content.

Since saline water has been proposed as an alternative irrigation source for sugar beet, attention should be focused on its positive and negative effects on quality and quantity of sugar beet.