کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9642683 | 513126 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Root growth dynamics of spring cereals with discontinuation of mouldboard ploughing
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
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چکیده انگلیسی
A vigorous root system is essential for efficient use of plant nutrients. This paper focuses on root growth and its response to tillage changes in the most fertile soil horizon, 0-40Â cm depth. The field experiment was established in 1995 on clay soil, with 45-50% clay and 5.5% organic matter in the topsoil. Three tillage treatments were mouldboard plough to a depth of 20Â cm (conventional), field cultivator to a depth of 8Â cm, and no primary tillage (conservation). The field had an oat (Avena sativa L.)-barley (Hordeum vulgare L.) crop rotation. In 1997-1998 and 2000, root distribution during the growing season was evaluated by a non-destructive minirhizotron (MR) and video recording method. Root length density and root diameter were also measured once a season (1997 and 1998) by destructive root sampling and image analysis of washed roots. At shoot elongation, root numbers increased more under conventional than conservation tillage, at soil depth of 10-25Â cm. The effect was clear for both barley (1997) and oat (2000) with maximum root numbers of 175 and 210 per 100Â cm2 by mouldboard ploughing, but 120 and 170 per 100Â cm2 under unploughed conditions (in the whole 0-0.4Â m region). The suboptimal condition of unploughed soil was also indicated by lower shoot nutrient contents at tillering (studied in 1997) and by higher penetrometer resistance (studied in 1998, 2000) and lower macroporosity (studied in 2000) at 10-25Â cm soil depth. Root growth dynamics were similar for both plant species. Root diameter was not significantly affected by the tillage treatments. Discontinuation of mouldboard ploughing reduced root growth (P<0.05) within this clay soil 5 years after the tillage change, although conservation tillage preserved more water for plant use. The data show that a clay soil can be too dense for optimal rooting during the 3rd-6th-years after discontinuation of ploughing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 80, Issues 1â2, January 2005, Pages 103-114
Journal: Soil and Tillage Research - Volume 80, Issues 1â2, January 2005, Pages 103-114
نویسندگان
Liisa M. Pietola,