Abstract
A research experiment was carried out to study the effect of soil application of urea and/or ammonium sulphate on some physiological aspects and biochemical composition of pearl millet (Pennisetum glaucum) plants during the vegetative growth period. The parameters analyzed were dry weight, water content, polysaccharides, total carbohydrates, phosphorus content, nitrogenous content and proline in roots and shoots as well as photosynthetic pigments content in the leaves. The results for roots indicated significant increases in dry weight, water content and direct reducing value due to the combination of urea with ammonium sulphate at 0.5% during the first and second periods and urea with ammonium sulphate at 0.3% in the third one. Total carbohydrates significantly increased due to application of ammonium sulphate at 0.5% in the second and third samples. Organic and total phosphorus significantly increased due to application of urea at 0.3% in the first and second samples. Applying urea at 0.5% achieved the highest value in total soluble N, protein-N, total-N and proline in first sample. Meanwhile, the combination of urea and ammonium sulphate at 0.3% resulted in high increases in total- N and protein - N in the second and third samples. Likewise, application of urea with ammonium sulphate at 0.5% caused the highest significant value in total soluble - N in the second sample compared with control and other treatments in roots.
Highlights
Pearl millet (Pennisetum glaucum) is the most widely grown type of millet and one of the major field crops in Yemen
The effects of applying different nitrogenous treatments on dry weight, water content and carbohydrate contents in roots of Pennisetum glaucum plants are presented in Table 1 for the first sample
The combination of urea and ammonium at 0.5% solution resulted in the highest values of dry weight, water content and direct reducing value (DRV) in the second sample
Summary
Pearl millet (Pennisetum glaucum) is the most widely grown type of millet and one of the major field crops in Yemen. The crop is principally produced for both human and animals. Nitrogen is one of the most important nutrients for the growth and yield of several crop. Nitrogen is the most limiting nutrient for cereal crops production. It is an essential component of structural amino acid, amides, nucleotides, nucleoproteins and is essential to cell division, expansion and nonstructural components of plant cells (Mengel and Kirkby, 1979). Ammonium (NH4) and urea in soils are the two main sources of available N for plant growth. Other nitrogen sources such as fertilizer applications have
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