Original scientific paper
BASAL, POTENTIAL AND RELATIVE RESPIRATION WITH DEPENDENCE ON APPLIED CROP RESIDUES AND BIO-STIMULATORS IN HAPLIC CHERNOZEMS
2011, 12 (4) p. 709-722
In this paper is looked for answers on following questions: 1. Which from crop residues and bio-stimulators more affected basal, potential and relative respiration? 2. Which from crop residues and bio-stimulators more affected the changes of potential and relative respiration dynamics during incubation? Therefore a laboratory experiments were established. In pots were added soil samples of loamy Haplic Chernozems (Ch), the crop residues of winter wheat (WR) and oil rape (RR) and bio-stimulators BETA-LIQ (B) and TRICHOMIL (T) were used. Variants of laboratory experiment were following: Ch, Ch+WR, Ch+WR+B, Ch+WR+T, Ch+RR, Ch+RR+B, Ch+RR-T. During incubation optimal temperature and moisture for decomposition of organic matter were kept. During incubation the basal and potential respiration were determined, and the values of relative respiration were calculated. The crop residues of RR had marked effect on increase the basal and potential respiration and on stability of organic substances as compared to crop residues of WR. Crop residues of WR had more marked effect on decreasing of nitrogen utilization. A higher amount of easy-utilized organic substances was found in variants with applied crop residues of WR as well. Tested bio-stimulators had effect on increase of basal respiration, but their effect was more marked in variants with WR. The effect of bio-stimulators was also very intensive in the end of incubation in variants with crop residues of winter wheat. From tested bio-stimulators B had more marked effect on basal and potential respiration. More easy-utilized organic substances were observed in variant with B as well as B had more marked effect on utilization of carbon and stability of organic substances as compared to T. The crop residues of WR had more marked effect on decrease the potential respiration dynamics than crop residues of RR and from bio-stimulators T, but only in variants with applied crop residues of WR.