This page has only limited features, please log in for full access.
Doc. Ing. Petr Šařec, Ph.D. is the head of the Department of Machinery Utilization (DMU) at the Faculty of Engineering (FE) of the Czech University of Life Sciences Prague (CULS). At the FE CULS, he participates in teaching of modules “Projecting Technological Processes” and “Services with Agricultural Machinery”, and guarantees modules “Project IT”, “Mobile Machinery Utilization”.
Objective: Biochar and a commercial humic acid-rich product, Humac (modified leonardite), represent soil amendments with the broad and beneficial effects on various soil properties. Their combination has been scarcely tested so far, although the positive impact of their interaction might be desirable. Materials and Methods: The dehydrogenase activity (DHA), microbial biomass carbon (Cmic), soil respiration (basal and substrate-induced), enzyme activities, total carbon (Ctot), and both shoot and root biomass yield were measured and compared in the short-term pot experiment with the lettuce seedlings. The following treatments were tested: the unamended soil (control), the Humac-amended soil (0.8 g·kg−1), the biochar-amended soil (low biochar 32 g·kg−1, high biochar 80 g·kg−1), and the soil-amended with biochar + Humac. Results: The effect of both amendments on the soil pH was insignificant. The highest average values of Ctot and Cmic were detected in high biochar treatment and the highest average values of basal and substrate-induced respiration (glucose, glucosamine, alanine) were detected in the low biochar treatment. The phosphatase activity and fresh and dry lettuce aboveground biomass were the highest in the low biochar + Humac treatment. Conclusions: Even though the combination of both biochar + Humac decreased the microbial activities in the amended soil (Cmic, DHA, enzymes, substrate-induced respiration) at the low biochar dose, they mitigated the detrimental effect of the high biochar dose on respiration (all the types) and the enzyme (phosphatase, arylsulphatase) activities. In contrast to the previously published research in this issue, the effects could not be attributed to the change of the soil pH.
Jiri Holatko; Tereza Hammerschmiedt; Rahul Datta; Tivadar Baltazar; Antonin Kintl; Oldrich Latal; Vaclav Pecina; Petr Sarec; Petr Novak; Ludmila Balakova; Subhan Danish; Muhammad Zafar-Ul-Hye; Shah Fahad; Martin Brtnicky. Humic Acid Mitigates the Negative Effects of High Rates of Biochar Application on Microbial Activity. Sustainability 2020, 12, 9524 .
AMA StyleJiri Holatko, Tereza Hammerschmiedt, Rahul Datta, Tivadar Baltazar, Antonin Kintl, Oldrich Latal, Vaclav Pecina, Petr Sarec, Petr Novak, Ludmila Balakova, Subhan Danish, Muhammad Zafar-Ul-Hye, Shah Fahad, Martin Brtnicky. Humic Acid Mitigates the Negative Effects of High Rates of Biochar Application on Microbial Activity. Sustainability. 2020; 12 (22):9524.
Chicago/Turabian StyleJiri Holatko; Tereza Hammerschmiedt; Rahul Datta; Tivadar Baltazar; Antonin Kintl; Oldrich Latal; Vaclav Pecina; Petr Sarec; Petr Novak; Ludmila Balakova; Subhan Danish; Muhammad Zafar-Ul-Hye; Shah Fahad; Martin Brtnicky. 2020. "Humic Acid Mitigates the Negative Effects of High Rates of Biochar Application on Microbial Activity." Sustainability 12, no. 22: 9524.
Physical properties of commercial fertilizers play important role from precision application point of view. Granulometric evaluation is usually performed by sieve separation according ČSN 01 5030 standard. The main subject of this work is the presentation of separation results when vertical airflow is used with NPK 20-8-8 and Dolophos fertilizers. The sample was divided into 8 individual specimens of 0.5 kg weight that was measured repeatedly. Every class of the specimen was than sieved on the sieves with holes 2 mm, 3.5 mm, and 5 mm resulting four new subclasses characterized by the sieve mesh dimension. It was achieved by statistical evaluation that relative frequencies are in agreement with N-distribution. It is clear from achieved values that in NPK 20-8-8 fertilizer samples there are 92.25 % of particles with dimension from 3.15 to 5 mm and 7.0 % with dimension from 2 to 3.15 mm. In fertilizer Dolophos there are 50.87 % of particles with dimension from 3.15 to 5 mm and 47.54% with dimension from 2 to 3.15 mm.Keywords: airflow, fertilizer, granulometry, particle, sorting.
Josef Krupička; Petr Šařec; Petr Novák. GRANULOMETRIC STUDY OF NPK 20-8-8 AND DOLOPHOS FERTILIZERS. Proceedings of the 7th International Scientific Conference Rural Development 2015 2015, 1 .
AMA StyleJosef Krupička, Petr Šařec, Petr Novák. GRANULOMETRIC STUDY OF NPK 20-8-8 AND DOLOPHOS FERTILIZERS. Proceedings of the 7th International Scientific Conference Rural Development 2015. 2015; ():1.
Chicago/Turabian StyleJosef Krupička; Petr Šařec; Petr Novák. 2015. "GRANULOMETRIC STUDY OF NPK 20-8-8 AND DOLOPHOS FERTILIZERS." Proceedings of the 7th International Scientific Conference Rural Development 2015 , no. : 1.