[Identification of rooting system and nitrogen absorption of four lettuce (Lactuca sativa L. var capitata) cultivars in field]
1996
Wijaya, K.A. (Universitas Jember (Indonesia). Fakultas Pertanian)
Intensive vegetable cropping is generally characterized by comparatively high nitrate leaching leading to contamination of the ground water. Reason for this are high N fertilizer input and low N uptake by especially leafy vegetables such as lettuce. The rooting system of lettuce is shallow which leads to low uptake efficiency of NO3-from the subsurface soil. The objective of the present study was to assess in field experiment the genotypic variation in lettuce for deeper rooting system and its role on uptake efficiency of nitrogen. This experiment was conducted on a sandy loam soil in Hannover, Germany. Significant differences among 4 lettuce cultivars could be established in root length densities at 0-15, 15-30 and 30-45, but not at 45-60 cm profile depth. Siletta show high root length densities at all of profile depth, uptake of nitrogen and low Nmin-Rest, particularly at 30-45 and 45-60 cm
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