Red rice is a troublesome weed now spread over almost all European rice fields. 3 field experiments were carried out in 1993-1994 and 1995 to assess the influence of different means of weed control on red rice seed reserves and of different tillage systems on seedling emergence. Treatments for weed control after false seeding were: dalapon at 15 kg ha-1, harrowing with blade harrow, shallow ploughing with light plough, untreated. Tillage systems tested in these trials were: no tillage, minimum tillage with blade harrow, normal and shallow ploughing done at different periods. The results showed that in undisturbed soil, red rice seedlings counted throughout the season all emerged from the beginning of April to mid-May. After 2 years, shallow ploughing and dalapon used for red rice control allowed the seed bank to remain quite stable over time. In untreated plots the seed bank increased by about 10-fold. The percentage of emergences in relation to the seed bank were strongly influenced by tillage systems: from 4.5 to 24.6% in harrowed plots, 1.3-2.5% in normally ploughed plots, 8.3-17.4% in superficially ploughed plots and 8.4-18.7% in untreated plots.
Prediction of red rice seedling densities from seed bank
FERRERO, Aldo;VIDOTTO, Francesco
1996-01-01
Abstract
Red rice is a troublesome weed now spread over almost all European rice fields. 3 field experiments were carried out in 1993-1994 and 1995 to assess the influence of different means of weed control on red rice seed reserves and of different tillage systems on seedling emergence. Treatments for weed control after false seeding were: dalapon at 15 kg ha-1, harrowing with blade harrow, shallow ploughing with light plough, untreated. Tillage systems tested in these trials were: no tillage, minimum tillage with blade harrow, normal and shallow ploughing done at different periods. The results showed that in undisturbed soil, red rice seedlings counted throughout the season all emerged from the beginning of April to mid-May. After 2 years, shallow ploughing and dalapon used for red rice control allowed the seed bank to remain quite stable over time. In untreated plots the seed bank increased by about 10-fold. The percentage of emergences in relation to the seed bank were strongly influenced by tillage systems: from 4.5 to 24.6% in harrowed plots, 1.3-2.5% in normally ploughed plots, 8.3-17.4% in superficially ploughed plots and 8.4-18.7% in untreated plots.
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