The investigations were carried out in 1996–2005 on the fields of Agricultural Experimental Station Department of SGGW Chylice in Mazowieckie voivodeship. The occurrence of diseases was assessed in 1996–2000 on winter wheat cv. Kobra, and in 2001–2005 on cv. Mikon. Weather conditions in ten-year experimental period were differentiated and had a distinct influence on plant infection by pathogens, as well as on the level of winter wheat yielding. In the first part of experimental period (1996–2000) the weather was characterized by higher temperatures compared to long-term average and higher amount of rainfall, with the exception of the year 2000 when the summer drought occurred. The highest for that period grain yield (54.70 dt/ha) was obtained in 1998. This was related to the lowest total infection of leaf surface area (22.76%) and a relatively low index of infection of stem base by Tapesia yallundae. In that year mass of 1 000 grain was also the highest. The lowest grain yield (40.80 dt/ha) was recorded in 2000 due to summer drought. In 1997 characterized by a high level of infection by T. yallundae (eyespot) obtained grain yield was also relatively low. In the second part of the experiment conducted on cv. Mikon (2001–2005) the lowest grain yield was recorded in 2001 (28.85 dt/ha) when per cent of leaf area infection of 2 upper leaves by Puccinia recondita (brown rust) was very high (44.79%), and the highest yield was obtained in 2003 (57.27 dt/ha). This was due to a moderate level of total leaf infection (30.21%) with fungal pathogens and favourable weather conditions for wheat development. In that year mass of 1 000 grain was also the highest. The occurrence of stem base infection by Fusarium spp. was maintained in the years 1996–2005 on differentiated level and it was lower in earlier years compared to the later period. The infection of ears by Leptosphaeria nodorum and Fusarium spp. was usually not high and its influence on the amount of grain yield not clearly evident. Chemical control of diseases influenced grain yield increase which was the highest in 2001 when winter wheat leaves were heavily infected by Puccinia recondita. The yield increase on fungicide treated plots was in that year 53.15%. It was evident that brown rust may pose a serious threat to winter wheat in the years of its high occurrence.

Straw, particularly cereal straw, is a valuable by-product of crop production, which can be used for various purposes, e.g. as livestock feed and bedding or for making fuels, however it should primarily be retained on farmland in order to prevent soil organic matter (SOM) losses and thus to maintain or improve soil quality. The aim of this study was to analyze effects of the frequency of crop residues (straw) incorporation into the soil on the content of soil organic matter and on crop yields. There were the following experimental treatments: SR – straw of all crop in the rotation removed, S1 – straw of one crop per rotation incorporated, S2 – straw of two crops in the rotation incorporated, and S3 – straw of three crops incorporated into the soil (loamy sand). After 21 years of crop rotation with straw removal (SR) the SOM level in the soil slightly decreased to 14.4 g∙kg ^–1 soil DM, compared to that in 1997 (14.6 g∙kg ^–1). However, when straw of one crop (rape) per rotation was incorporated (S1) the content of SOM increased to 15.0 g∙kg ^-1 soil DM, and to 15.6 and 16.0 g∙kg ^–1 in S2 and S3 treatments respectively. Straw retention had also a beneficial effect on the content of labile fractions of SOM (hot water extractable C and N). Grain yields and yield components of wheat and triticale, and seed yields of rape in the SR treatment were not significantly different from those obtained in S1, S2 and S3 treatments.

The research was conducted in Tartous Governorate during the two agricultural seasons (2018–2019 and 2019–2020) under control conditions, the aim of the research is to study the relationship between the productivity of five promising strains of bread wheat (‘ACSAD 1256’, ‘Douma 58847’, ‘Douma 58585’, ‘Douma 64453’, ‘ACSAD 1149’) and two cultivars (‘Douma 2’ and ‘Douma 4’) and some quantitative indicators of drought: stress tolerance index ( STI), mean of productivity ( MP), modified stress tolerance index ( MSTI), and relative yield ( RY).
Cultivation was carried out in pots filled with light sandy silty soil, and three treatments of 70, 50, and 30% of the field capacity were applied in addition to the control and with three replications for each treatment.
The strains ‘Douma 58585’ and ‘Douma 58847’ gave high yield values for grain in the two agricultural seasons. It was also found that there were significant differences between the two seasons in yield between the control and drought stress factors and drought tolerance indicators, such as stress tolerance index, modified stress tolerance index ( MSTI), mean of productivity ( MP), and relative yield ( RY).
On the other hand, a positive and strong relationship was found between STI, MSTI, and MP in both treatments and both seasons. The research concluded that the best indicators, which were related to the productivity, whether in the control or transactions and in the two growing seasons together, are STI and MP, which are promising indicators in the classification of stress-tolerant cultivars or strains.

Straw is a valuable by-product of crop production which can be used for various purposes (livestock feed and bedding, bioenergy). However, it should primarily be retained on farmlands to prevent soil organic matter (SOM) losses. Straw retained on the field is usually incorporated into the soil when conventional (with ploughing) and reduced tillage systems are used or left on the soil surface (mulching) when a no-tillage system is practiced. The aim of this study was to determine how different straw management practices (straw removal, straw incorporation and straw mulching) affected the incidence of Cephalosporium gramineum on two winter wheat cultivars, the grain yield of these cultivars and selected soil properties based on a long-term micro-plot experiment. Cephalosporium stripe disease was absent or occurred at very low levels (0–2.4%) when straw was removed or incorporated every second year. The disease was most severe, 24–33% tillers infected, in the SM(N) treatment with yearly straw mulching and cv. Bogatka was more tolerant to C. gramineum infection than cv. Bamberka. Importantly, yearly straw incorporation into the soil in contrast to straw mulching resulted in low disease levels (5–8% tillers infected) in both cultivars. Only in the case of cv. Bamberka was the grain yield significantly reduced in the SM(N) treatment compared to other treatments. The soil in this experiment contained the lowest level of soil SOM, which amounted to 21.0 g ∙ kg ^–1 soil dry matter (DM), when each year wheat straw was removed (SR). Straw incorporation every second year resulted in 24.2 g of SOM ∙ kg ^–1 soil and the largest amounts of SOM (26.0–26.1 g ∙ kg ^–1 soil) were found with yearly straw incorporation into the soil. Yearly straw mulching was inferior in this respect and the soil in this treatment contained 23.8 g of SOM ∙ kg ^–1 soil DM.