Effects of Different Planting Densities on the Agronomic Characters and Yield of Dual-Purpose(Seed and Stalk)Industrial Hemp
In order to understand the suitable planting density for the production of dual-purpose in-dustrial hemp in Dali,Yunnan Province,this study selected Yunma 7 as the experimental material and conducted comparative experiments on five planting densities(10 000,20 000,30 000,40 000,and 50 000 plants/hm2)to study their effects on the agronomic characteristics,seed yield,and stem yield of industrial hemp.The results showed that planting density affected the seed maturity period of Yunma 7,with densely planted seeds about 2 days earlier than sparsely planted ones.Low density planting results in a higher proportion of female hemp,while high density planting results in a basic male to female ratio of 1 ∶ 1.The highest height of male hemp plants is 343.5 cm at a density of 50 000 plants/hm2.The thic-kest stem diameter was 29.9 cm and the most branch number of male hemp was 32.6 at a density of 10 000 plants/hm2.The leaves and stems weight of single plant of male hemp also reached the highest at a density of 10 000 plants/hm2,i.e.0.10 and 0.43 kg/plant,respectively.The highest leaves yield of male hemp is 863.33 kg/hm2 under the planting density of 40 000 plants/hm2,followed by 846.33 kg/hm2 under the planting density of 50 000 plants/hm2.Similarly,the highest stem yield of male hemp was 4081.33 kg/hm2 at a planting density of 40 000 plants/hm2,followed by 3662.33 kg/hm2 at a planting density of 50 000 plants/hm2.For female hemp,the plant height is the highest at a density of 50 000 plants/hm2,at 330.5 cm,while the stem diameter and branch number are the thickest or most at a density of 10 000 plants/hm2,at 30.8 mm and 18.5,respectively.The seed and stem weight of single plant of female hemp is the highest at a density of 10 000 plants/hm2,with 0.16 and 0.56 kg/plant,respectively,followed by 50 000 plants/hm2.The highest stem yield of female hemp is at a planting density of 50 000 plants/hm2,which is 8438.90 kg/hm2.The total stem and seeds yield of hemp were also the highest at a planting density of 50 000 plants/hm2,at 12 101.23 kg/hm2 and 1438.10 kg/hm2,respectively.Taking into account the seeds and stem yield of hemp,it is concluded that the suitable density for planting Yunma 7 as a seed and stalk industrial hemp plant in Dali,Yunnan Province is 50 000 plants/hm2.
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