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In a two-year field study, the changes in Cu, Zn, Mn and B concentrations in aerial parts of lupine and pea were observed under traditional and no-tillage system. In each year, plant material samples were collected four times at 10-day intervals, from 30 days after sowing to the flowering stage. In plants of one species but grown under different tillage systems, differences in the content of micronutrients occurred in the early growth season, and tended to disappear in the early inflorescence phase. In general, these concentrations were higher in plants under traditional tillage system. However, under drought conditions these concentrations were higher in plants under no-tillage system. Regardless of a tillage system, some changes in micronutrient concentration during the vegetation period were observed. Concentration of copper in aerial parts of plants evidently decreased as the plants grew older. Fluctuations in the levels of Zn, Mn, and B did not follow such clearly defined tendencies and were dependent on the plant’s species and individual elements.
A two-factorial field experiment was performed in a randomized block design with three replications in 2010-11 in the Experimental Garden of the University of Warmia and Mazury in Olsztyn, to determine the effect of seedling planting time on the concentrations of mineral compounds in basil leaves. Plot area was 1.2 m2. The experimental factors were: (1) plants of sweet basil, purple (purpurascens) basil, and cinnamon basil, and (2) time of planting basil seedlings. The concentrations of macroelements (total nitrogen, phosphorus, potassium, magnesium, calcium, and sodium) and microelements (iron and copper) were determined in basil leaves. The content of total nitrogen, phosphorus, potassium, magnesium, calcium, and sodium in basil leaves depended on the cultivar. Cinnamon basil contained the highest concentrations of total nitrogen, phosphorus, magnesium, and calcium, whereas sweet basil had the highest content of potassium and sodium. The time of planting seedlings had a significant effect on the iron content of basil leaves, which was higher in plants that developed from seedlings planted on 19 May.
The study was carried out to asses the influence of soil mineral fertilization, manure application and soil liming on changes in the concentration of microelements (B, Cu, Fe, Mn and Zn) in soil solution. The tests were performed on samples of sandy soil collected from long-term fertilization experiments being conducted on lessive soil of the granulometric structure of clayish sand. Soil solution was prepared with the suction method. The concentration of microelements in soil solution was determined by means of the ICP method. The results showed an increase in Fe, Mn, Zn and Cu and a decrease in B and Mo in soil solution when soil was fertilized with nitrogen. The concentration of microelements in soil solution was not significantly influenced when soil was fertilized with phosphorous and potassium. Liming had a significant effect on a decrease in the concentration of Fe, Mn, Zn and Cu and an increase in B and Mo in soil solution. Soil application of manure significantly increased the concentration of microelements in soil solution.
The authors calculated the total sum of microelements in plants and determined the percentage share of specific elements in this sum according to the ANE method. Then, both the changes of the microelements share in the sum and the changes of absolute microelement concentrations in plant tissues depending on soil pH were investigated. The sample collections of four plant species from the Silesia region, Poland, constituted the research material (156 samples in total). It was found that, in general, the Mn share in the sum decreased and the Fe share increased with increasing pH level. Moreover, the change of micronutrient weight-concentrations in plant tissues, which was caused by the pH changes, did not correspond with the change of the micronutrient relationship in the total sum. This result suggests that the assessment of micronutrient status in plants is not a reliable enough method when basing solely on the absolute weight-concentration in plant tissues.
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