No abstract

In addition to the dry (D) and rainy (R) seasons, a combination of the two i.e., rainy-dry (RD) and dry-rainy (DR), can also be observed in one year. The effects of the dry (D) and rainy (R) on soil are known, hence we hypothesized that the effects of the rainy-dry (RD) and dry-rainy (DR) periods on soil may differ from the former assessments. The aim of the study is to investigate the effect of six tillage treatments (ploughing—P, disk tillage—DT, loosening—L, tine tillage (a deeper—T and a shallower—ST) and no-till—NT) on earthworm abundance and crumb ratio during a long-term research (16 years) on Chernozems. The results related to the four year-groups (D, R, RD, and DR) with different residue cover. Seven degrees of cover ratio (between 12.5% and 62.5%) were selected on stubbles. Higher cover ratio (≥52.5%) improved water conservation, increased earthworm abundance (31 and 41 ind m–2) and crumb (78 and 82%) ratio (p < 0.001). R year came first in the rank of water content and earthworm abundance and DR proved to be more favorable for crumb formation. Considering the rank of soil tillage treatments, ST takes first place in evaluation of soil water content (SWC) and crumb ratio, and NT for earthworm abundance.

This study provides an overview of the development of soil tillage in Hungary. The primary goal is to present factors that have been promoting and hindering progress in tillage from the first authoritative records -from the eleventh century -up to now when soil tillage became a tool in the climate damage mitigation methods. Progress was restricted during the first eight hundred years of the history of tillage by lack of expertise and the use of primitive tools. In retrospect, much of the traditions are regarded as obstacles to progress while the adoption of certain foreign trends fostered development in most cases. The history of the development of tillage in Hungary is divided into seven eras, with equal positive and negative impacts on the quality of the soils. The quality of soils was threatened before 1900 primarily by the multi-ploughing systems, while reasonable tillage offered a chance for improvement. The geographical location of Hungary in Europe and the Hungarian language entailed a certain degree of isolation as well. It may have been the reason why Hungarian reasonable tillage could not become a forerunner of minimum tillage. New soil tillage methods developed abroad had influenced primarily education and experiments carried out in Hungary. After the regime change, however, such methods came to be driving progress in practice as well, thanks to a widened horizon. In 1998 soil conservation tillage were used on about 25 per cent of the total sown land, however, a decade and a half later the area cultivated by conservation methods had doubled. A survey conducted five years ago found that significant progress had been made in soil conservation tillage in dry seasons but the achievements are often eroded by return to the conventional modes during wet seasons.

Conservation tillage harmonizes soil protection with demands of the crop, soil and climate. The continuous conservation tillage improves soil properties and modifies impact of weather extremes. The aim of the paper was to investigate the changes in four soil physical states affected by soil conservation tillage and to evaluate soil water content in a critical period. The study was carried out on Chernozems applying six tillage treatments, that are loosening, ploughing, tine tillage (a deeper, and a shallower), disk tillage and direct drilling. The investigation suggested that soil conservation was the major solution resulting in the balanced water content (SWC) and penetration resistance values in both treatments under peculiar weather conditions. However, the crumb ratio and the crusted area resulted in significant differences between the treatments, presumably due to the level of surface preservation. Soil water content differed significantly between months, with higher contents in spring and lower values in the end of summer. The higher SWC expected at the beginning of the growing season was reliably fulfilled, but the SWC level for workabilty differed from the optimum.

Specification of the tillage trends (conventional, reduced, conservation etc.) and endeavours (e.g., energy saving, sustainable) has been made possible in the last 50-60 years. Soil protection has become the main requirement in the soil conservation trend contributing to the implementation of the long-term defence strategy [1]. In the relevant experiments, control often involves conventional tillage as a treatment with negative impact on soil compared with treatments that present a possible solution as direct drilling, mulch-till, etc. [2]. Nowadays soil tillage aim has been changed. The minimal soil disturbance may be replaced with soil intervention to the required extent that is reinforced by the use of several protection techniques, e.g., surface cover, surface layer consolidation, loosened layer adaptable to the water conservation and organic matter protection. Today, soil health evaluates compliance of the tillage systems and appropriate factors are applied that could be evaluated anywhere: crumb ratio, soil moisture range