Ayhan Horuz

Artan NaCl stres şartlarında besin çözeltisine ilave edilen humik asidin domates bitkisinin verim ve bazı meyve kalite özellikleri üzerine etkileri

The objective of this research was to determine the effect of humic acid added into nutrient solution on yield, stem+leaf, root dry matter, some fruit quality properties of tomato plant under the increasing NaCl stress conditions. Experiment was planned in 3x4 factorial design with three replicates. Peat and perlit (1:1 ratio) were used as a solid media. Four humic acid doses (0-320-640 and 1280 ppm) were added into nutrient solutions including three sodium chloride (NaCl) doses (0-44.4 and 70.4 mM). Twelve different nutrient solutions were applied to each pot as 100 mL/day until flowering period and 200 mL/day from flowering period to harvest time. Fruit yield decreased significantly by the NaCl effect, but it was not affected by the humic acid application. Humic acid significantly increased stem+leaf dry matter amount, but NaCl decreased it. Humic acid application at 0-44.4 and 70.4 mM NaCl levels increased stem+leaf dry matter content as 19.04-7.26 and 21.49 % ratios, respectively and provided tolerance to NaCl at 70.4 mM level. Humic acid at low dose caused significant increase in root dry matter, but it decreased at higher humic acid dose. NaCl caused significant decrease in root dry matter. Humic acid increased root dry matter content 26.18% at 70.4 mM NaCl dose and provided tolerance to NaCl. humic acid significantly increased dissolved dry matter content in fruit and fruit juice pH. NaCl significantly increased dissolved dry matter content, but decreased fruit juice pH. humic acid significantly decreased fruit number having blossom end rot, but NaCl increased it. Humic acid decreased fruit number having blossom end rot at 44.4 and 70.4 mM NaCl doses and provided tolerance to NaCl.

Substrat kültüründe domates bitkisi yaprağında besin kapsamı, K/Na ve Ca/Na oranları üzerine besin çözeltisine artan dozlarda ilave edilen NaCl’ün etkileri

The aim of this study was to determined the effects of NaCl added in the increasing doses to the nutrient solutions on the ratios of K/Na and Ca/Na, the nutrition of tomato plant growing in substrate culture. NaCl were found to have effects on the nutrient element contents and rates of tomato leaves. The effect of NaCl added in nutrient solution on the K/Na and Ca/Na levels in leaves of tomato were found statistically significant at 0.01 levels. NaCl added in nutrient solution decreased the rates K/Na and Ca/Na of leaves significantly. The effect of NaCl added to the nutrient solution on the content of N, P, Mg, S, Fe, Zn and Cu in leaves of tomato were found statistically insignificant. But, the effect of NaCl added in nutrient solution on the content of K, Na, Ca, Mn and B in leaves of tomato were found significant statistical respectively at 0.01-0.05-0.05-0.05 and 0.01 levels. NaCl added to the nutrient solution decreased the content of K, Ca, Mn ve B of the leaves of tomato, but significantly increased the content of Na.

The effect of various plant residues on microbial activity and N mineralization in Kurupelit soil

A laboratory study was conducted to determine the effect of various plant residues on the N mineralization and microbial activity as applied to Kurupelit soil at the rate of 2 g C/kg soil. Results showed that while nitrogen mineralization increased, respiration and dehydrogenase (DHG) -enzyme activity decreased as a function of time. The properties of added materials played a pre-eminent role on respiration and enzyme activity in the first 10 days. A residual enzyme-activity was observed between 10th and 60th days. C/N ratio was found to affect the net mineralization under the present conditions for decomposition of plant residues. Nitrogen addition is virtually necessary for short-term decomposition when C/N ratio is large.