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Soybean cultivation is becoming more and more popular in many countries, including Poland, due to the high nutritional value of its seeds, its resistance to diseases and pests, as well as lower propensity to lodging compared to other legumes. Under the climatic conditions of Poland, soybean yield is largely dependent on weather conditions in a particular growing season, primarily temperature and rainfall. Studies on the effect of tillage systems used for soybean cropping under the climatic conditions of Poland are scarce. This proves the need to continue such research. The aim of this study was to compare the effect of conventional tillage (CT) and no-tillage (NT) on yield, weed infestation and seed qualitative composition of the ‘Mazowia’ soybean cultivar grown under the conditions of the Lublin Upland. A field experiment was carried out in the period of 2009-2012 at the Czesławice Experimental Farm (51°18′23″N 22°16′2″E). In 2010 the soybean plantation was terminated due to adverse weather conditions and related inhibited plant emergence. The experiment was set up on loess-derived grey-brown podzolic soil as a split-block design in four replicates. The present study showed that the soybean seed yield obtained under conventional tillage conditions was higher by 14.6% compared to that obtained under no-tillage. A higher plant density after emergence and before harvest as well as a higher plant height were found in the conventional tillage treatment. The protein, oil and fibre content in soybean seed was significantly affected only by weather conditions in particular growing seasons. A higher weed weight and richer floristic composition of weeds were found under no-tillage conditions in relation to conventional tillage.
The aim of research was determination of the content of selected constituents (dry matter, ash, α-aminonitrogen, reducing sugars, Mg, Ca, K), of sugar beet roots grown under conservation tillage using mulch from straw, winter rye and winter vetch, as well as two levels of nitrogen fertilization. This experiment was conducted between 2007–2010 at the Experimental Station of University of Environmental and Life Sciences in Wroclaw. From among conservation tillage systems of sugar beet, the highest amount of ash was found in roots grown under rye mulch and the lowest one was found in roots collected from plots under fore-crop straw mixed with harrow. Sugar beet roots under mustard mulch had the best technological quality (the lowest amount of α-amino-nitrogen) while the worst quality was observed under winter vetch mulch.
An experiment, conducted over the period 2008–2010, evaluated the effect of tillage system on the occurrence and species composition of anthropophytes in winter wheat, maize and spring wheat. Regardless of crop plant and tillage system, anthropophytes (73.9%), represented by archaeophytes and kenophytes, were the main component of the flora in the crops studied, whereas apophytes accounted for the remaining 26.1%. Most archaeophytes (13 species) were found in the spring wheat crop under no-tillage, while their lowest number (6 species) occurred in the spring wheat crop under conventional tillage. The only kenophyte, Conyza canadensis, was found to occur in the spring wheat and maize crops in the no-tillage system. The following taxa were dominant species among archeophytes: Geranium pusillum, Anthemis arvensis, and Viola arvensis (regardless of tillage system and crop plant), Anthemis arvensis (in spring wheat – conventional tillage), Echinochloa crus-galli and Setaria glauca (in maize – reduced tillage and no-tillage), Chenopodium album (in maize – no-tillage) as well as Apera spica-venti, Anthemis arvensis and Papaver rhoeas (in winter wheat – no-tillage).
The present research covers the time of the second rotation: sugar beet-spring wheat-pea-winter triticale (1999-2002). The investigations were conducted on a very good rye complex soil. A reduced tillage for sugar beet and no-tillage for the other crops in crop rotation result in labor, fuel and energy consumption reduction, as compared with conventional tillage by an average of 50% and expenditure by 42%. The highest energy effectiveness in crop rotation was observed in the system in which sugar beet was cultivated in reduced tillage, and other crops in no-tillage. The effectiveness increases by 135% for conventional tillage for all the crops in rotation. The lowest effectiveness is obtained for conventional tillage with intercrop for sugar beet and pea, and conventional tillage for spring wheat and winter triticale.
A field experiment was carried out (1994–1999) on mixed chernozem rendzina originating from cretaceous bedrock. Three cultivation systems were used: conventional tillage (CT), ploughless tillage (PL), and direct drilling (DD). The simplified cultivation systems marginally influenced the water retention ability of the soil. Water retention properties of rendzina were most favourably shaped under CT, while PLresulted in a slight worsening when compared to CT, and the least favourable influence on the retention properties was exerted by DD.
In the period from 1995 to 1998, tests were carried out on some physical soil properties and crop yields in rotation to determine simplified tillage systems. The investigations included traditional tillage (TT), minimum tillage (MT) and zero tillage (ZT). On the basis of the results obtained, it was found that in those years with precipitation and temperature distribution favourable to plant vegetation, the tillage simplifications MT and ZT did not bring about any decrease in maize or oat yields. The course of the weather having been unfavourable to the growth of plants (deficit of precipitation, severe winter), those plots tilled in the simplified way yielded about 20% less (winter wheat 1995/96 and 1997/98) than those under traditional cultivation. The superiority of the simplification of cultivation lay primarily, in the reduced labour required and in the organisational convenience of the running of the farms. Additionally, the simplifications applied to the tilling contributed to increased bulk density and the penetration resistance of the soil. As a consequence, water supplies deteriorated, particularly in periods with precipitation deficits. It could be argued that the simplifications analysed - when compared to traditional soil cultivation - intensified the negative effects resulting from the precipitation deficit.
The influence of hybrid rye production technology on the amount and structure of energy inputs and the energy efficiency index of production were compared in a field experiment. The level of energy inputs is mainly determined by materials, including mineral fertilizers, which account for about 85.6% of accumulated energy invested in the production of rye. The required energy inputs in the form of fuel constitute approximately 12.3%, and in the form of aggregates – 2.1%. The amount of energy inputs necessary for the production of hybrid rye totals 17.52 GJ·ha-1 on average, while resigning from mineral fertilization in the spring reduces this value to 14.12 GJ·ha-1. The most favourable energy efficiency index in the production of hybrid rye, following winter rape cultivation, was recorded when no nitrogen fertilization was applied in the spring.
The influence of reduced tillage (RT) on the biochemical properties of soil and crops has been studied thoroughly worldwide. In contrast, we lack regular results on long-term (more than 20 years) RT and especially no-till (NT) impact on the composition of soil and main crops in semi-humid subarctic climate of the Baltic States. For this reason, investigations were carried out at the Research Station of Aleksandras Stulginskis University, Lithuania, in 2009–2012. The aim was to investigate the influence of RT and NT on soil pH, phosphorus (P) and potassium (K) concentrations, enzymatic activity and abundance of earthworms. This study comprised soils which were conventionally (CP) and shallowly (SP) ploughed, deeply chiselled (DC), shallowly disked (SC) and not tilled (NT). Primary tillage systems did not have significant impact on the soil pH or its P and K content but initiated the separation of soil layers into an upper one (0–15 cm), with a higher P and K status (55.5% P and 59.0% K of the total content), and a bottom one (15–25 cm), with lower concentrations of the elements (44.5 and 41.0%). Non-inversion tillage systems and NT raised the activity of soil enzymes such as saccharase by 32.2 to 60.8% and urease by 1.6- to 3.1-fold. The most marked rise in enzyme activity occurred in SC and NT soil. RT systems lead to an increase in the number and biomass of earthworms in the soil under wheat but the highest rise of the earthworm number and biomass was observed in NT plots, where the average count of earthworms doubled and their biomass increased by 3.7-fold compared with CP. In general, NT was the most efficient system in terms of the enrichment of soil biochemical properties.
Soil tillage is one of the greatest energy consumers in agriculture and also a significant contributor to CO₂ emissions. For this reason, field experiments with different tillage systems and their influence on fuel consumption and CO₂ emissions were carried out at two locations in Eastern Slovenia. Three tillage methods were researched: direct seeding after gliphosat spraying (DS-G), reduced tillage with chisel plough and seeding (RT), and conventional tillage with mouldboard plough, rotary harrow and seeding (CT). The testing crop was corn silage (Zea mays L.) in rotation after ryegrass. The highest fuel consumption was under the CT system; the CO₂ emission was 225.03 kg ha⁻¹ on silty clay loam and 188.06 kg ha⁻¹ on silty loam. The use of the DSG system saved on average 164.41 kg ha⁻¹ of diesel oil and the use of the RT system, 104.77 kg ha⁻¹. At both locations, the highest yield of dry matter was produced with CT, followed by DS-G and RT; however, on silty clay loam the difference was significant. The alternative soil tillage reduced the CO₂ emission on average by 79.45% (DS-G) and 61.07% (RT). Presuming the use of the CT system in the growing of corn silage on arable land of Eastern Slovenia would decrease from its current 93.7% by 30% as forecasted under the EU soil tillage trend, the total annual emissions of CO₂ could be reduced by 1.08 Gg, or 24.0%.
Adoption of sustainable tillage can protect soils from biological degradation and maintain soil quality, as compared with conventional management. This paper presents findings from a long-term tillage experiment carried out in Endocalcari-Endohypogleyic Cambisols on a sandy loam soil in Lithuania. The tillage systems were: conventional (CT), moderate (MT), and no tillage (NT). Tillage intensity positively affected microbial substrate utilization and urease activity, as well as, negatively, dehydrogenase activity, bacteria and fungi amounts, and Shannon diversity index of microbiological community. Higher total porosity provoked higher enzyme activity; but, microbial activity correlated negatively with bulk density.
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