Nitrogen fertilization and row width affect self-thinning and productivity of fibre hemp (Cannabis sativa L.) |
| |
| Institution: | 1. DLO Research Institute for Agrobiology and Soil Fertility (AB-DLO), PO Box 14, 6700 AA Wageningen, Netherlands;2. Department of Agronomy, Wageningen Agricultural University, Wageningen, Netherlands;3. Research Station for Arable Farming and Field Production of Vegetables, Lelystad, Netherlands;1. Institute of Soil water and Environmental Sciences, Volcani Center, 68 HaMaccabim Road P.O.B 15159, Rishon LeZion, 7505101, Israel;2. Eastern Regional R&D Center, Kiryat Arba, Israel;1. Laboratory of Heat-Equipment Research and Testing, Lithuanian Energy Institute, Breslaujos Str. 3, LT-44403, Lithuania;2. Vytautas Magnus University, Department of Environmental Sciences, Vileikos St. 8, Kaunas LT-44404, Lithuania;3. Laboratory of Combustion Processes, Breslaujos Str. 3, LT-44403 Kaunas, Lithuania;1. Center for Bioprocess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark;2. Department of Forest Products/Wood Science, Swedish University of Agricultural Sciences, Vallvägen 9D, 750-07 Uppsala, Sweden;3. Section of Composites and Materials Mechanics, Department of Wind Energy, Technical University of Denmark, 4000 Roskilde, Denmark;1. Département de Biologie, Université de Moncton, Moncton, New Brunswick, E1A 3E9 Canada;2. Plant Medic Inc., Cocagne, New Brunswick, E4R 3G8 Canada |
| |
| Abstract: | In fibre hemp (Cannabis sativa L.) a high plant density is desirable, but inter-plant competition may cause self-thinning, which reduces stem yield and quality. We investigated whether agronomic factors could reduce self-thinning in hemp. The effects of soil nitrogen level (80 and 200 kg ha−1), row width (12.5, 25 and 50 cm), type of sowing implement, and thinning method on self-thinning, growth, yield and quality of hemp were determined in field experiments in 1991 and 1992. Soil nitrogen level affected plant morphology before self-thinning occurred. Due to enhanced competition for light more plants died from self-thinning at 200 than at 80 kg N ha−1. In August, stem yield of living plants was similar at the two nitrogen levels, but 5% of the plants had died at 80 kg N ha−1 and 25% at 200 kg N ha−1. Although dry matter losses resulting from self-thinning were greater at 200 than at 80 kg N ha−1, crop growth rate was greater at 200 than at 80 kg N ha−1. Apparently, the crop growth at 80 kg N ha−1 was affected by a lack of nitrogen. At final harvest in September stem yield of living plants was 10.4 t ha−1 at 80 and 11.3 t ha−1 at 200 kg N ha−1, bark content in the stem was 35.6% at 80 and 34.0% at 200 kg N ha−1. The effect of row width on self-thinning was small relative to that of nitrogen level. More self-thinning took place at 50 cm row width than at 12.5 and 25 cm. During early growth and also in August stem yield was smaller when row width was larger; in September row width did not affect stem yield or quality. Type of sowing implement and thinning method did not affect self-thinning or stem yield. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
