In the agroecological conditions of Vojvodina, there is not enough research on the influence of plowing cover crops as a green manure on the content of labile organic carbon soluble in hot water (HWOC). The aim of the study was to determine the influence of crop rotation of different species of winter cover crops (CC) and spring crops in the subsequent sowing period (corn, soybeans and Sudan grass) on the content of organic matter (OM) levels as well as the dynamic of labile OM. Research was carried out at the Rimski Šančevi experimental station under Chernozem soil type. The winter CC consisted of the combined intercrops: winter pea (Pisum sativum ssp. Arvense L.) + triticale (×Triticosecale Wittm. ex A. Camus) (PT) and single-species CC winter pea (P) and control (without CC). Plowing of CC and control plots was carried out at a depth of 27 cm in the last decades of May 2018, and the sowing of maize, soybean and Sudan grass in early June with addition of 50 kg N ha-1 . Sampled was done in October at depth of: 0-20 cm, 20-40 cm. The analysis of variance determined a significant effect of cultivated crops (maize, soybeans and Sudan grass) in the subsequent sowing period on the changes of the HWOC content, as well as the interaction of cover crops and fertilization. The highest value of HWOC was measured in maize (658 µg g-1 ) on the variant P N0 (0-20 cm), and the lowest in the Sudan grass P N50 (20-40 cm). The highest share of HWOC in the total OM content was found in maize (2.56%), while the lowest share was measured in Sudan grass (1.87%).

/pdf/hot-water-extractable-organic-carbon-of-chernozem-under-the-4baquk3i9l.pdf

Hot water extractable organic carbon of chernozem under the system of cover crop incorporation and subsequent sowing of spring crops

/pdf/impact-of-organic-production-on-parameters-of-soil-4vc70dkseu.pdf

Impact of organic production on parameters of soil compaction

The intensive form of agricultural production often leads to disruption of physical, chemical and biological properties of the soil. Therefore, in recent years there has been an increasing focus on research and finding ways to preserve the soil with management practices that support soil conservation. The research was conducted on the experimental field of the Institute for Field and Vegetable Crops Novi Sad on Rimski Šančevi. The experiment was set up as a randomized block design. The winter cover crops consisted of the combined intercrops: Triticale (×Triticosecale Wittm. ex A. Camus) and winter pea (Pisum sativum ssp. arvense L.) (T+P), solo winter fodder pea crop (Pisum sativum ssp. arvense L.) (P) and a control without winter cover crops (sole or mixtures)(Ø). The experiment with winter cover crops was divided into two blocks. In the first block, the winter cover crops were chopped and plowed, while treatments in the second block were mowed using a rotary mower and the fodder was removed for feeding ruminants. After ploughing and preparing the soil for sowing, sowing of spring crops (soybean, maize and sudan grass) was carried out on all varieties in the subsequent sowing period. This research aims to determine the influence of different types of winter cover crops and spring crops from subsequent sowing period on the physical properties of Chernozem with a special emphasis on soil structure. It was determined that values of MWD on the treatments where the mixture of cover crops (T+P plowed) ranged from 1.11 mm to 1.39 mm, which indicated a better aggregates stability compared to the control treatments where no cover crops were sown. Due to variable root morphology and water requirements, which may alter soil structure, it is required to pay more attention to the adaptation of management strategies through the use of cover crops as well as the selection of their mixes.

Crops influence on Chernozem soil structure Influence of winter cover crops and different spring crops on soil structure indicators on

Organic agriculture is a production system based on the principles of preserving or improving soil properties. Bulk density acts as an indicator of soil compaction, which significantly affects the physical properties and thus the water-air regime of soil. The structure is a key factor of soil fertility that is affected by a numerous factors and therefore easily subjected to change. The aim of this study was to determine the effects of organic and conventional production on aggregate stability and compaction of soil. The study was conducted on Vozar farm in the Kisac at three sites on chernozem, where the two adjacent fields of conventional and organic production were sampled. The considerable variability in the measured values of bulk density and aggregate stability was obtained. The compaction of chernozem was at the level of maximum allowable compaction or lower. The stable macroaggregates (> 250 µm) were dominated in the organic production compared to conventional due to the higher inputs of organic matter in organic production. Higher values of MWD were obtained in organic production compared to conventional and ranged from 319-591 µm. Organic production has dissimilar effects on the physical properties of the soil, which is often dependent on impact of external, usually climatic factors.

/pdf/impact-of-organic-and-conventional-production-on-stability-53aklw3qcg.pdf

Impact of organic and conventional production on stability of soil aggregates

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Impact of organic and conventional production on stability of soil aggregates

Impact of organic production on parameters of soil compaction