Abstract

     This study was conducted on sorghum crop (sorghum bicolor L.) Alhaiq cultivar to assess the effect of biological and chemical fertilizers on morphological growth characteristics and vegetative content of mineral elements of crop plants growing in the area of Musabaine, Aden governorate, on clay- silts soils where the rate of electrical conductivity increases by 1.4 mm/cm.This study was carried out using randomized complete block design with four replications. The experiment included six treatments (i.e. phosphorous, nutropin, and microbial containing bacteria stabilizing air nitrate and facilitating phosphorene absorption from the soil, two types of chemical fertilizers: urea containing 46% N and superphosphate containing 46% P₂O₅ , in addition to untreated control (without addition). Main results obtained can be summarized as follows:

• Sorghum plants responded to the added rates of biological and chemical fertilizers. Different treatments showed significant differences compared to untreated control (without addition) in growth indicators (plant length, stem thickness, number of leaves , leaf area LA (m²) ) and the two biological fertilization treatments as nutropin at the rate of 55 g / kg seeds and the chemical fertilization treatment an average of 60 kg N + 25 kg P₂O₅ / hectare over the other studied parameters and gave the highest values of growth characteristics in both two seasons study 2018-2019 and 2019-2020.

Addition of biological and chemical fertilizers led to a significant effect among study treatments on characteristics of plant leaves and stems mineral content of elements and compounds studied for the characteristics (percentage of protein and leaf content of chlorophyll A, B and total chlorophyll) as well as the ratio of mineral elements to both nitrogen, phosphorene and potassium in leaves. Biological fertilization treatment nutropin and phosphorene and chemical fertilization treatment of 60kg N + 25 P₂O₅ gave the highest values ​​in plant leaves and stems mineral content of the studied plants, while all treatments were surpassed compared to untreated control (without addition) during both seasons of study.