The Effect of Different Levels of Nitrogen, Phosphorous and Potassium in Some Growth Properties of Rosa Damascena Mill L.

The experiment was conducted on cuttings of Rosa damascena mill L. During the period from mid-March of 2014 until the end of 2015 before the period of formation of flowers for picking at the College of Agriculture/University of Karbala According to the design of complete random sectors, The research included a global experiment with three different factors of the first chemical fertilizer nitrogen fertilization and three levels (0, 0.5 and 1 gm N. Kg -1 soil) and fertilization with the element phosphorus with three levels (0, 15 and 30 mg P2O5. Kg -1 soil) and three levels of Potassium (0, 100 and 200 mg K2O. Kg -1 soil). The results showed that the single effect of the fertilization treatment with nitrogen, phosphorous, and potassium resulted in a significant increase in the characteristic of plant height and number of leaves, and the fertilization treatment with nitrogen and phosphorus component separately resulted in the production of seedlings that were characterized by a high dry green weight compared to the comparison treatment. The data of the bilateral overlap between nitrogen and phosphorous indicate the presence of significant differences, as the treatment with nitrogen component gave a concentration of (0.5 and 1 g. Kg-1) overlapping with the component of phosphorus concentration (30 mg. Kg-1) with the highest significant rate of (39.66 cm). The treatment of the triple interference between nitrogen, phosphorous, and potassium gave a significant effect on all the studied traits.

Effective use of various forms of nitrogen fertilizers in barley cultivation

The paper aims to assess the use of various forms of nitrogen fertilizers (seedbed dressing and foliar dressing) in barley cultivation in the steppe and forest-steppe zones of the Omsk region. The research objects were barley, nitrogen fertilizers, ordinary steppe chernozem, forest-steppe meadow chernozem. Variety – Sasha. The most agronomic efficiency in the steppe zone, 5.52 kg of grain derived from 1 kg of fertilizer nitrogen, was yielded in response to the use of N30 in the form of ammonium nitrate and urea during sowing. N60 (seedbed dressing + foliar fertilizing) resulted in a reimbursement of 1 kg of fertilizer active agent in the maximum amount of 4.44 kg (ammonium nitrate + urea, ammonium nitrate + UAN). The greatest reimbursement in the forest-steppe zone, 11.11 kg of grain from 1 kg of fertilizer nitrogen, resulted from the use of N30 in the form of ammonium nitrate and UAN during sowing. N60 (seedbed dressing + foliar dressing) resulted in a reimbursement of 1 kg of active agent in the maximum amount of 11.11 kg of barley (ammonium nitrate + urea). The richest harvest of barley was taken in following seedbed dressing and supplementary fertilizing applied together during the growing season in a total dose of 60 kg/ha. In this case, the yield did not reliably depend on the forms of nitrogen fertilizers used; a greater effect resulted from nitrogen fertilizers in the forest-steppe zone.

Fixed-time corrective dose fertilizer nitrogen management in wheat using atLeaf meter and leaf colour chart

Fertilizer nitrogen (N) management in any region following standard general recommendations discount the fact that crop response to N varies between sites and seasons. To devise field-specific N management in wheat at jointing stage (Feekes 6 growth stage) using atLeaf meter and leaf colour chart (LCC), eight field experiments were conducted in three wheat seasons during 2017–2020 in the West Delta of Egypt. In the first two seasons, four experiments consisted of treatments with a range of fertilizer N application levels from 0 to 320 kg N ha−1. Monitoring atLeaf and LCC measurements at Feekes 6 growth stage in plots with different yield potentials allowed formulation of different criteria to apply field-specific and crop need-based fertilizer N doses. In the four experiments conducted in the third season in 2019/20, different field-specific N management strategies formulated in 2017/18 and 2018/19 wheat seasons were evaluated. In the atLeaf-based fertilizer N management experiment, prescriptive application of 40 kg N ha−1 at 10 days after seeding (DAS) and 60 kg N ha−1 at 30 DAS followed by application of an adjustable dose at Feekes 6 stage computed by multiplying the difference of atLeaf measurements of the test plot and the N-sufficient plot with 42.25 (as derived from the functional model developed in this study), resulted in grain yield similar or higher to that obtained by following the standard treatment. The LCC-based strategy to apply field-specific fertilizer N at Feekes 6 stage consisted of applying 150, 100 or 0 kg N ha−1 based on LCC shade equal to or less than 4, between 4 and 5 or equal to or more than 5, respectively. Both atLeaf- and LCC-based fertilizer N management strategies not only recorded the highest grain yield levels but also resulted in higher use efficiency with 57–60 kg N ha−1 in average less fertilizer use than the standard treatment.