NITROGEN-FERTILIZATION AND ROW WIDTH AFFECT SELF-THINNING AND PRODUCTIVITY OF FIBER HEMP (CANNABIS-SATIVA L)

被引:42
作者
VANDERWERF, HMG
VANGEEL, WCA
VANGILS, LJC
HAVERKORT, AJ
机构
[1] DLO, AGROBIOL & SOIL FERTIL RES INST, AB, 6700 AA WAGENINGEN, NETHERLANDS
[2] AGR UNIV WAGENINGEN, DEPT AGRON, WAGENINGEN, NETHERLANDS
[3] RES STN ARABLE FARMING & FIELD PROD VEGETABLES, LELYSTAD, NETHERLANDS
关键词
CANNABIS SATIVA; FERTILIZER; FIBER HEMP; MANAGEMENT PRACTICES; MORPHOLOGY; NITROGEN; SELF-THINNING;
D O I
10.1016/0378-4290(95)00017-K
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
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.
引用
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页码:27 / 37
页数:11
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