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Open access

Tomasz Spiżewski and Mikołaj Knaflewski

The Effect of Irrigation Methods on the Yield of Pickling Cucumber

The effects of drip irrigation combined with fertigation and sprinkler irrigation combined with broadcast fertilisation on the yield of pickling cucumber were compared in an experiment carried out over three years. The control treatment was broadcast fertilised and did not receive any irrigation.

For the three years, on average, no difference in the yields of cucumber was found between sprinkler and drip irrigated plants; however, in one year the yield of the drip irrigated crop was higher. The percentage of fruit of pickling size was higher and the non-marketable yield lower when cucumber plants were drip irrigated. Drip irrigation was more efficient than sprinkler irrigation. Irrigation decreased the total sugar and vitamin C content, but there was no difference between drip and sprinkler irrigation.

Open access

Dorota Frużyńska-Jóźwiak, Krzysztof Sobieralski, Marek Siwulski, Tomasz Spiżewski, Lidia Błaszczyk and Iwona Sas-Golak

Effect of Trichoderma Isolates on Yielding of Wild Strains of Coprinus Comatus

The impact of infestation with Trichoderma aggressivum f. europeanum and Trichoderma longibrachiatum isolates on the yielding of three wild strains and one cultivated strain of Coprinus comatus was investigated. A significant yield reduction of C. comatus on substrates infested with the examined Trichoderma isolates was determined. The recorded percentage yield reduction was significantly higher in the case of the infestation with the T. aggressivum than with the T. longibrachiatum isolate.

Open access

Alina Kałużewicz, Włodzimierz Krzesiński, Mikołaj Knaflewski, Jolanta Lisiecka, Tomasz Spiżewski and Barbara Frąszczak

Summary

Three-year studies on the influence of temperature on vegetative growth and growth of broccoli heads (Brassica oleracea var. italica cv. Fiesta) were carried out at the Experimental Station “Marcelin” of Poznań University of Life Sciences in Poland. The relationship between temperature sum day-degree, number and area of leaves as well as head diameter was estimated. Likewise relationship between number and area of leaves and head diameter was established. The correlations were described using linear, curvilinear and segment linear regression. The relationship between temperature sum day-degree and number of leaves was linear, whereas the correlation between temperature and area of leaves and head diameter was curves function. On the basis of segment linear regression it was found that in the period when slow growth of heads was observed (the size of up to about 1.5 cm), the area of leaves increased the fastest. It occurred between the 24th and 27th day after planting. The fastest growth of broccoli heads was noted, when the plant had about 18 leaves and area 4900 cm2. In the period of rapid head growth, the increase of sum temperature of 100 day-degree resulted in head diameter increase by 3.5 cm.

Open access

Krzysztof Sobieralski, Marek Siwulski, Monika Komon-Żelazowska, Lidia Błaszczyk, Romuald Górski, Tomasz Spiżewski and Iwona Sas-Golak

Evaluation of the Growth of Trichoderma Pleurotum and Trichoderma Pleuroticola Isolates and Their Biotic Interaction with Pleurotus Sp.

Growth of Trichoderma pleurotum and T. pleuroticola isolates on the Potato Dextrose Agar (PDA) medium was investigated. T. pleuroticola isolates showed a significantly greater diameter of their mycelium colonies after 5 days of incubation than the T. pleurotum isolates. In addition, biotic interactions between T. pleurotum and T. pleuroticola isolates and species of Pleurotus sp. were determined. The following six species of oyster mushroom were used: P. florida, P. cornucopiae, P. pulmonarius, P. columbinus, P. ostreatus and P. eryngii. It was demonstrated that isolates of the T. pleuroticola species limited the growth of the examined species of oyster mushroom to a much greater extent than the isolates of the T. pleurotum species.