Sclerotinia borealis -sienen merkitys nurmiheinien talvehtimisen heikentäjänä Helsingin yliopiston koetilalla Inarin Muddusniemessä vuosina 1950-65 II. Viljelytekniikan vaikutus nurmen talvehtimiseen

Authors

• Oiva Nissinen Hankkijan kasvinjalostuslaitos, Tammisto
• Arvi Salonen Helsingin yliopiston kasvipatologian laitos

DOI: https://doi.org/10.23986/afsci.71817

Abstract

Below are findings on the effect of different techniques of cultivation on the wintering of grasses at the Muddusniemi Experimental Farm at Inari (69°04' N, 27°06' E) in 1957—65. The leys established in June and July wintered best and also produced the highest dry-matter yields. In the leys sown in August, the incidence of S. borealis was high and the yields were very poor. Under conditions unfavourable for the growth of stands, a nurse crop improved the wintering and yield of grasses susceptible to S. borealis in 1957/58. Nitrogen fertilization improved the development of timothy leys and reduced injuries due to S. borealis in first-year leys. It was most effective in late sowings. Under the favourable growing conditions of the 1961 early sowings, plentiful nitrogen fertilization and abundant growth had the negative effect of increasing the incidence of Fusarium nivale. Quintozene (PCNB) application decisively improved the wintering of grasses. When the incidence of S. borealis was very high, as in 1960/61, quintozene was not fully effective in protecting timothy leys. The differences in wintering between sowing dates were still visible, as were also differences between different grassland species in 1956/57. The application of quintozene to first-year leys also had the residual effect of significantly increasing yields in second-year leys in 1965. Summary p. 125.