Start Date

29-11-2007 12:00 AM

Description

Soil tillage has significant impact on the dynamics of soil moisture and nutrient in the soil systemand the subsequent efficient extraction of soil water and uptake of nutrient by crop plants. Besides incorporating fertilizer and crop residue in the soil system, soil tillage improves soil aeration, the mineralization and availability of N and P and the subsequent uptake of both N and P by crop plants (Carter and Rennie, 1987; Dinnes et al., 2002; House et al., 1984; Varco et al., 1993). Contrary to conventional tillage systems, long-term no-tillage systems enhance greater mineralizable C and N pools in the soil system (Woods and Schuman, 1988; Doran, 1980). Therefore, the uptake of N by crop plants can be potentially changed with different tillage systems and their interactions with different N rates and N application timing. A significant interaction of tillage systems such as no-tillage (NT), conventional tillage (CT) or minimum tillage and N rate was observed on grain N uptake with increasing N removal as N rate increased (Halvorson et al., 2001). Therefore, an understanding of the effect of different tillage systems and their interactions with N rate from different N sources on the dynamics of available N and N uptake by crop plants at different growth stages is critical to the efficient management of N in crop production system. Similarly, plant P uptake is a function of soil moisture availability, the concentration of P in plant tissues, which decreases with plant age and water stress (Payne et al., 1995).

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Nov 29th, 12:00 AM

Interaction of Tillage and Nitrogen Rate Effect on Corn Response and N and P Uptakein a Corn-Soybean Rotation

Soil tillage has significant impact on the dynamics of soil moisture and nutrient in the soil systemand the subsequent efficient extraction of soil water and uptake of nutrient by crop plants. Besides incorporating fertilizer and crop residue in the soil system, soil tillage improves soil aeration, the mineralization and availability of N and P and the subsequent uptake of both N and P by crop plants (Carter and Rennie, 1987; Dinnes et al., 2002; House et al., 1984; Varco et al., 1993). Contrary to conventional tillage systems, long-term no-tillage systems enhance greater mineralizable C and N pools in the soil system (Woods and Schuman, 1988; Doran, 1980). Therefore, the uptake of N by crop plants can be potentially changed with different tillage systems and their interactions with different N rates and N application timing. A significant interaction of tillage systems such as no-tillage (NT), conventional tillage (CT) or minimum tillage and N rate was observed on grain N uptake with increasing N removal as N rate increased (Halvorson et al., 2001). Therefore, an understanding of the effect of different tillage systems and their interactions with N rate from different N sources on the dynamics of available N and N uptake by crop plants at different growth stages is critical to the efficient management of N in crop production system. Similarly, plant P uptake is a function of soil moisture availability, the concentration of P in plant tissues, which decreases with plant age and water stress (Payne et al., 1995).

 

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