article · Sustainability
Agricultural non-point source pollution often stems from the loss of nitrogen and phosphorus from cultivated soils. A field trial on dry farmland in southern China compared conventional tillage against four conservation tillage methods: no-tillage direct seeding, no-tillage transplanting, minimum tillage direct seeding, and minimum tillage transplanting. The trials assessed impacts on soil physical and chemical properties, nutrient movement, and nutrient losses in runoff and drainage water. Minimum tillage direct seeding and no-tillage direct seeding preserved and improved soil properties within the zero to twenty centimetre depth layer. In addition, no-tillage transplanting and no-tillage direct seeding markedly lowered nitrogen and phosphorus losses compared to conventional tillage. These findings identify specific conservation tillage practices as effective, sustainable options for enhancing soil fertility while mitigating nutrient runoff from maize fields.
Unchecked runoff of nitrogen and phosphorus from farmland depletes soil fertility and drives widespread water pollution. Demonstrating that specific conservation tillage practices reduce these losses provides agricultural managers with practical methods to protect surrounding water systems. It also allows growers to retain valuable soil nutrients, supporting longer-term agricultural sustainability and land health without relying exclusively on conventional tilling.
This applied research provides validated land-management methods for maize growers, farm managers, and agricultural extension services seeking to cut fertiliser wastage and manage runoff. Because the practices rely on existing operational techniques such as direct seeding and transplanting rather than novel equipment or formulations, they are near to practical adoption, though the abstract describes agronomic field practices rather than a commercialised product.
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Monitoring nitrogen (N) and phosphorous (P) losses on farmland is essential for the prevention of agricultural non-point source pollution (NPS). This study was conducted on typical dry farmland in southern China to determine the effect of conservation tillage and conventional tillage (CT) on soil physical and chemical properties, nutrient movement, as well as on N and P losses. Four conservation tillage techniques (i.e., no-tillage direct seeding (NTDS), no-tillage transplanting (NTTS), minimum tillage direct seeding (MTDS), and minimum tillage transplanting (MTTS)), as well as one CT technique, were carried out in a randomized complete block design with three replicates each. The results suggest that MTDS and NTDS improved soil physical and chemical properties by ensuring adequate retention of these properties at the 0–20 cm soil depth. Low levels of N and P losses in runoff and drainage water were recorded under NTTS and NTDS compared to CT. Our results, therefore, suggest that conservation tillage approaches, such as MTDS and NTDS, are the most suitable tillage techniques for improving soil nutrients and reducing agricultural N and P losses while providing an eco-friendly and sustainable agricultural practice.
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DOI: 10.3390/su11082397
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