Two experiments were carried out near Vercelli over the 1993-1997 period to evaluate the influence of different management methods on rotational crops in a red rice seed bank. In experiment 1, the rotation was rice-rice-soyabean-rice. In the 2 years of rice cultivation, 2 red rice management conditions were considered: chemical control with dalapon at 13 kg ha-1 a.i. in pre-planting and no-control. Soyabean was planted in the seedbed which ad been prepared with a minimum tillage and treated in post-emergence against red rice with cycloxydim at.1.5 L ha-1. In the fourth year rice was again planted and the red rice was controlled over the whole surface with dalapon at 13 kg ha-1 a.i in pre-planting. In experiment 2, the rotation was rice-soyabean-rice. In the first and third years of rice cultivation the red rice was controlled with dalapon at 13 kg ha 1 a.i. in pre-planting. Three treatments were compared for the soyabean: a) mouldboard ploughing and planting in April; b) harrowing and planting after red rice emergence at the end of May; c) no tillage, glyphosate treatment after the red rice emergence and planting at the end of May. After 2 years of rice cultivation the seed bank of the dalapon-treated plots increased by about 65% in the 0-10 cm and by 20% in the 10-20 cm layer. In the untreated plots, the seed bank increased by about 10 fold both in the 0-10 and 10-20 cm layers. After the soyabean cultivation, the red rice seeds sampled in the 0-10 cm layer decreased by about 97% in all the plots. In the fourth year, the residual seed bank of the 0-10 cm layer reduced in the plots which had previously been treated and untreated by about 100 and 67%, respectively. In experiment 2, the greatest decrease in the seed reserve was recorded after the soyabean cultivation, in the plots with the minimum tillage and delayed planting, where the seed bank decreased by 99 and 75% in the 0 10 and 10 20 cm layers respectively.
Influence of the rotation on seed bank evolution of red rice (Oryza sativa [L.] var. sylvatica)
FERRERO, Aldo;VIDOTTO, Francesco
1997-01-01
Abstract
Two experiments were carried out near Vercelli over the 1993-1997 period to evaluate the influence of different management methods on rotational crops in a red rice seed bank. In experiment 1, the rotation was rice-rice-soyabean-rice. In the 2 years of rice cultivation, 2 red rice management conditions were considered: chemical control with dalapon at 13 kg ha-1 a.i. in pre-planting and no-control. Soyabean was planted in the seedbed which ad been prepared with a minimum tillage and treated in post-emergence against red rice with cycloxydim at.1.5 L ha-1. In the fourth year rice was again planted and the red rice was controlled over the whole surface with dalapon at 13 kg ha-1 a.i in pre-planting. In experiment 2, the rotation was rice-soyabean-rice. In the first and third years of rice cultivation the red rice was controlled with dalapon at 13 kg ha 1 a.i. in pre-planting. Three treatments were compared for the soyabean: a) mouldboard ploughing and planting in April; b) harrowing and planting after red rice emergence at the end of May; c) no tillage, glyphosate treatment after the red rice emergence and planting at the end of May. After 2 years of rice cultivation the seed bank of the dalapon-treated plots increased by about 65% in the 0-10 cm and by 20% in the 10-20 cm layer. In the untreated plots, the seed bank increased by about 10 fold both in the 0-10 and 10-20 cm layers. After the soyabean cultivation, the red rice seeds sampled in the 0-10 cm layer decreased by about 97% in all the plots. In the fourth year, the residual seed bank of the 0-10 cm layer reduced in the plots which had previously been treated and untreated by about 100 and 67%, respectively. In experiment 2, the greatest decrease in the seed reserve was recorded after the soyabean cultivation, in the plots with the minimum tillage and delayed planting, where the seed bank decreased by 99 and 75% in the 0 10 and 10 20 cm layers respectively.
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