This study is aimed to investigate the effects of different biochars obtained from tomato harvest residues (THR) on the growth, nutrient concentrations and nutrient uptakes of corn plant. For this purpose, biochars were produced using THR, using a pyrolyser at temperature of 300, 400, 500, 600, and 700 ºC with application duration of 40, 80, 120, and 240 minutes. THR had C and N content of 22.12 % and 2.00 %, respectively. Biochars obtained at five application temperatures and four application durations were applied with the rates of 10 and 40 t•ha-1. The experiment was conducted in a greenhouse. After 2 months growth period, the plants were harvested above ground of the soil. Harvested plants were washed and dry weighted and mineral nutrient concentrations of the plants were determined. The results showed that low application rate (10 t•ha-1) of biochar obtained at 300-600 ºC and at longer duration increased the plant growth. However, there is no systematic effect of different biochar applications on nutrient concentrations of corn plant generally.

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In this study, it was aimed to determine the effect of the use of plastic (PE) and fabric materials with different colors and properties on the growth and mineral nutrition of lettuce plant.. Methods and Results: The research was conducted for 2 years in greenhouse conditions in 2018-2019. In the study, It consists of 3 different PE mulch material, porous fabric material and control applications. Lettuce plant was grown as a plant material in the experiment. P, K, Ca, Mg, Fe, Zn, Mn, and Cu analyzes were made with the dry weight values of the lettuce plant harvested at the end of the cultivation period and the differences between the applications were revealed. When the data obtained in the control group on plant dry weight for both years were compared with other applications, it was determined that the most effective mulch applications were transparent PE mulch and bubble PE mulch applications. The effects of the treatments on the P and Ca concentrations of the plants were found to be significant for both years, while the effects on the K and Mg concentrations were significant for only one year. The effects of the applications on the micro element concentrations of the plant were generally found to be significant for both years. It has been determined that the amount of nutrients removed varies according to different mulch applications. If a general evaluation is made, it has been observed that the highest intake of nutrients is realized by plants grown under Ş-PE mulch and B-PE mulch applications. Conclusions: It was observed that the highest lettuce microelement concentrations for both years were obtained from control application, and the effects of the other applications on the micro element concentrations of the plant were generally similar Significance and Impact of the Study: When a general evaluation was made regarding the effect of mulch applications on nutrient concentrations of the plant, it was seen that the nutrient concentrations of plants with lower plant dry weight values were higher. The highest nutrient uptake was generally seen in transparent PE mulch and bubble PE mulch.

Documentation Centre (NIDOC) some potential toxic element (B, Cd, Cr, Ni, Co, and Pb) concentrations of wheat grown under greenhouse conditions. For this reason, 0, 15, and 30 tha -1 of BD were applied to the soils and incubated for 0, 30, and 60 days. After the end of the incubation period wheat seeds were sawn and left for growth for 2 months. The results indicated that BD dosages and incubation periods increased plant dry weight. Applications of incubated BD did not affect B, Cd and Co concentrations of wheat, while Cr and Ni concentrations decreased generally with the BD dosages. Similarly, incubation showed a decreasing effect on Pb concentration of wheat. Plant Co, Cr, and Pb uptakes did not vary with the applications of BD, other element uptakes increased in the parallels of plant dry weights. The element concentrations of wheat were in the ranges of acceptable levels. So, it was concluded that the application of BD did not pose a risk for potentially toxic elements on the growth of the wheat.