EJPAU, 2015, Volume 18, Issue 3

No /
Available Online
Sort By:
Date - Discipline - Title
Hide Abstracts
18(3) #01
06 Jul 2015
citation  abstract  html 

The work presents research results from 2006–2009. The study aimed at comparing tuber yield performance and quality of potato tubers manured with undersown catch crops in the integrated and organic production system. Two factors were considered in the experiment: 1. manuring with undersown catch crop: control (no catch crop), farmyard manure, undersown catch crop biomass ploughed under in the autumn (Persian clover, Persian clover + westerwolds ryegrass, westerwolds ryegrass), undersown catch crop biomass retained as mulch on the soil surface until the spring (Persian clover, Persian clover + westerwolds ryegrass, westerwolds ryegrass); and 2. production system: integrated and organic. Spring triticale cultivated for grain was undersown with the catch crops and was followed by table potatoes the following year. At harvest, the total and marketable yields of potato tubers were measured. Samples were taken to determine starch content, vitamin C content and true protein content. The results of the study demonstrated that the highest potato tuber yields were harvested from Persian clover/westerwolds ryegrass plots as well as Persian clover mulch plots. Potato tuber yield and chemical composition were affected by the production system. An application of undersown catch crops, excluding westerwolds ryegrass, can fully replace farmyard manure used in potato cultivation.


18(3) #02
31 Aug 2015
citation  abstract  html 

To investigate the effect of salicylic acid on some morphological traits and yield of dragonhead under water deficit conditions, a field experiment was done at Department of Natural Resource and Watershed of Piranshahr, Iran, in 2012. The experiment was arranged as a split plot, based on randomized complete block design with three replications. The experimental treatments consisted of three levels of irrigation after 40, 80 and 120 mm evaporation from pan as the main plots and three levels of the plant foliar application with salicylic acid as the subplots (0, 0.5 and 1 mM). The results showed that the irrigation treatments had significant effects on the plant height, the main stem diameter, number of lateral branches, floral branches length, number of leaves and biological yield. The maximum and minimum value of the mentioned traits respectively was obtained in the treatments of 40 and 120 mm. Salicylic acid effect on the biological yield was significant, so that the maximum biological yield (638 g·m-2) belonged to the 1 mM salicylic acid application, while the control had 24.8 percent increase and had no significant difference with the 0.5 mM salicylic treatment. Interaction of the water deficit stress and salicylic acid on the number and length of floral branches in the plant was significant. The highest number of floral branches (mean 3.73 per plant) was observed in 40 mm evaporation from the pan with foliar application of 0, 0.5 and 1 mM salicylic acid and its lowest value was obtained with two levels, 80 and 120 mm, of evaporation from the pan without salicylic acid application.

18(3) #03
30 Sep 2015
citation  abstract  html 

The aim of the present research was to determine the effect of drip irrigation on the activity of enzymes (rhodanese and arylsulphatase) participating at cycling sulphur in soil and content of total sulphur and sulphate (VI) in soil under crops cup plant. The research material was derived from an experiment located at Kruszyn Krajeński in the vicinity of Bydgoszcz. The main factor of the experiment was irrigation at following variants: O – without irrigation (control plots), D – with drip irrigation. The plant material was made up by plants seedlings from micropropagation. The amount of sulphur available for plants, in the soil investigated for control plots was, on average, 7.62 mg·kg-1 and for the irrigation plots it was similar 5.88 mg·kg-1, which, according to the soil richness with sulphur S-SO42- classifies it as the soil of its average content and growing cereals requires supplementary fertilisation with sulphur. There was shown a high sensitivity of arylsulphatase on the changes in soil moisture and a greater stability in the activity of rhodanese on that factor.

Legend:  Citation Citation Information     Abstract View Abstract     Article (HTML) View Article (HTML)     Article (PDF) View Article (PDF)