关键词: 农业气象灾害, 农业气象灾害, 遥感, 玉米, 评估

Abstract: A field trial was conducted to improve the level of cultivation and to evaluate the effects of different planting densities and fertilizer methods on yield of purple yam with the directional-notch technology. Purple yam was cultivated in the field experiment which had four planting densities (0.25 m×1.4 m, 0.3 m×1.4 m, 0.35 m×1.4 m, 0.4 m×1.4 m) and two kinds of fertilizations (basal application of conventional bulk blend fertilizer and slow-release fertilizer). The results showed that: the yield of purple yam per plant increased with the increasing of planting density, and the yield was the highest under the planting density of 0.4 m×1.4 m. Conversely, the yield of per unit area was in contrast to the yield per plant, while the planting density of 0.25 m×1.4 m had the highest yield. The fertilization experiment showed that the purple yam yield per plant under the basal application of non- coated slow- release fertilizer was 0.17 kg higher than that under the conventional bulk blend, which meant that the yield was 3779.1 kg higher per hectare. Therefore, the planting density of 0.25 m×1.4 m with slow-release fertilizer was an effective way of planting purple yam.