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| Zhao, Jin; De Notaris, Chiara; Olesen, Jørgen E.. |
| Nitrate leaching losses from arable cropping systems cause severe damages to the environmental services worldwide. There is a considerable need for methods that allow rapid, easy and area covering detection of nitrate leaching to guide N management. We used three years of data from the 5th cycle of a long-term crop rotation experiment in Denmark to quantify the relationships between nitrate leaching in autumn and winter and field conditions in autumn as defined by three vegetation indices [VIs; Ratio Vegetation Index (RVI), Normalized Difference Vegetation Index (NDVI), Ratio Red Edge (RRE)] in autumn. Following cereal crops, catch crops significantly reduced nitrate leaching in autumn and winter, whereas this was only the case for one out of the three... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Air and water emissions; Farm nutrient management. |
| Ano: 2019 |
URL: http://orgprints.org/35137/1/Manuscript-20190324.pdf |
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| De Notaris, Chiara; Rasmussen, Jim; Sørensen, Peter; Melander, Bo; Olesen, Jørgen E.. |
| Legume-based cover crop (CC) mixtures can increase nitrogen (N) availability in arable systems, reducing the need for external N inputs, as they retain soil N and fix atmospheric N2. However, they need sufficient biomass accumulation to influence soil N availability. Early establishment through undersowing can improve CC growth and plant N accumulation, but competition with the main crop should be minimized. This study aimed to investigate the effect of main crop inter-row spacing (12, 18, 24 cm), manure application (without, with) and CC undersowing (early, late, no cover crop) on N accumulation in a legume-based CC mixture and the residual N effect on the following crop. We conducted a field experiment in Denmark with spring wheat as main crop and spring... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Farm nutrient management. |
| Ano: 2019 |
URL: http://orgprints.org/35015/1/De%20Notaris%202019_cover%20crop%26row%20spacing.pdf |
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| De Notaris, Chiara; Sørensen, Peter; Rasmussen, Jim; Olesen, Jørgen E.. |
| Increasing the row space of spring wheat from 12 to 24 cm, but maintaining the same seeding density, didn´t decrease its yield. On the other hand, it positively influenced the growth of the undersown catch crop, a mixture of red clover, white clover, rye grass and chicory. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Nutrient turnover; Weed management; Farm nutrient management. |
| Ano: 2016 |
URL: http://orgprints.org/30876/1/Session%203-57-58.pdf |
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| De Notaris, Chiara; Rasmussen, Jim; Sørensen, Peter; Olesen, Jørgen E.. |
| Legume-based cover crops (CC) provide a wide range of ecosystem services, including nitrate leaching reduction, N fertilizer and soil C sequestration effects. However, the scarcity of information on belowground C and N increases the uncertainty on the magnitude of these effects. With the present study, we quantified soil C and N deposition from legume-based CC (two pure legumes and two mixtures) grown under field conditions, in Denmark. To do so, we labeled CC plants with 13C (CO2) and 15N (leaf-labeling) throughout their growing period, by following a frequent multiple-pulse labeling scheme. Then, we incubated labeled CC roots and soil to investigate C and N mineralization. Cover crops with red clover produced about 2.7 Mg ha-1 aboveground biomass, and... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2019 |
URL: http://orgprints.org/35017/1/CC%20lab_all_20190314.docx |
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| De Notaris, Chiara; Rasmussen, Jim; Sørensen, Peter; Olesen, Jørgen E.. |
| Components of the field nitrogen (N) balance (input and surplus) are often used to predict nitrate leaching from agricultural lands. However, management factors, such as use of catch crops, greatly affect the actual loss and are a key to reduce N leaching. The present study is based on the 4th cycle of a long-term crop rotation experiment in Denmark, and it aims to quantify, from a crop rotation perspective, the influence on N leaching from N input and surplus or management factors. The experiment included three cropping systems (two organic and one conventional) with or without use of animal manure and catch crops. N leaching was calculated from measurements of nitrate in soil water sampled with ceramic suction cups installed at 1 m depth in all plots. At... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions; Farm nutrient management. |
| Ano: 2018 |
URL: http://orgprints.org/32665/1/De%20Notaris%202018_N%20leaching.pdf |
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| De Notaris, Chiara; Rasmussen, Jim; Sørensen, Peter; Olesen, Jørgen E.. |
| Components of the field nitrogen (N) balance (input and surplus) are often used to predict nitrate leaching from agricultural lands. However, management factors, such as use of catch crops, greatly affect the actual loss and are a key to reduce N leaching. The present study is based on the 4th cycle of a long-term crop rotation experiment in Denmark, and it aims to quantify, from a crop rotation perspective, the influence on N leaching from N input and surplus or management factors. The experiment included three cropping systems (two organic and one conventional) with or without use of animal manure and catch crops. N leaching was calculated from measurements of nitrate in soil water sampled with ceramic suction cups installed at 1 m depth in all plots. At... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions; Farm nutrient management. |
| Ano: 2017 |
URL: http://orgprints.org/31728/1/AGEE18205.pdf |
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| De Notaris, Chiara; Sørensen, Peter; Rasmussen, Jim; Olesen, Jørgen E.. |
| N availability is one of the main factors limiting productivity in organic arable systems. Legume-based catch crops (CC) were shown to both increase N yield and reduce N leaching at the crop rotation scale, but strategies to stabilize their growth are required (De Notaris et al., 2018). The present study showed that early CC sowing time and an increased main crop row space can help stabilize CC growth and increase N accumulation, especially when the conditions for the CC are not favorable. Despite the variations in N accumulated in CC biomass, legume-based catch crops represent a valuable source of N for the subsequent crop, with their fertilizer value being less variable than the N accumulated in CC biomass. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Denmark; Farm nutrient management. |
| Ano: 2018 |
URL: http://orgprints.org/33053/1/De%20Notaris_N%20workshop%20abstract.doc |
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