不同播种密度对工业大麻种子产量的影响

Effects of Different Planting Densities on Seed Yield of Industrial Hemp

为了掌握辽宁省工业大麻生产适宜的种植密度,选用1-26和1-25-683两个品系,进行7个播种密度(1.67、2.50、3.33、5.00、10.00、50.00、120.00万穴/hm^(2))的比较试验,研究其对工业大麻生产的农艺性状、种子产量及雄株纤维产量等的影响。结果表明:品系1-26种子产量在1298.70~1836.20kg/hm^(2),种植密度为2.50万穴/hm^(2)和3.33万穴/hm^(2)时,种子产量较高,分别为1836.20、1802.70kg/hm^(2),纤维产量分别为563.41、474.45kg/hm^(2)。品系1-25-683种子产量在663.20~1336.95kg/hm^(2),在种植密度为1.67万穴/hm^(2)时种子产量最高,达到1336.90kg/hm^(2),纤维产量为462.62kg/hm^(2)。同时,随着种植密度的增加,株高、茎粗、单株产量、果序长度、果序数量、小穗数量逐渐降低,种子产量降低,纤维产量增加。故辽宁省工业大麻1-26和1-25-683两个品系在辽阳试验地的播种密度在1.67~3.33万穴/hm^(2)时种子产量最高,如兼收雄麻纤维可适当增加密度。

In order to screen the optimal planting density for industrial hemp production, a randomized block experiment was conducted with two lines -1-26 and 1-25-683. The effects of different planting densities on agronomic characters, seed yield, male fiber yield and other factors of industrial hemp were investigated by setting 7 planting densities, 1.67×10^(4), 2.50×10^(4), 3.33×10^(4), 5.00×10^(4), 1.00×10^(5), 5.00×10^(5), 1.20×10^(6) points/hm^(2). The results showed that: the seed yield of line 1-26 was 1298.70-1836.20 kg/hm^(2), which appeared the higher seed yield up to 1836.20 kg/hm^(2) and 1802.70 kg/hm^(2) at the density of 2.50×10^(4) points/hm^(2) and 3.33×10^(4) points/hm^(2), followed by the fiber yield of 563.41 kg/hm^(2), 474.45 kg/hm^(2) respectively. For line 1-25-683, the seed yield was 663.20-1336.95 kg/hm^(2) showed the highest seed yield of 1336.90 kg/hm^(2) at the density of 1.67×10^(4) points/hm^(2), and fiber yield were 462.62 kg/hm^(2). Moreover, with the increase of planting density, plant height, stem diameter, infructescence length, infructescence number, spikelet number and seed yield decreased gradually while fiber yield increased. To sum up, the optimal planting density for industrial hemp production in Liaoyang area is 1.67×10^(4)-3.33×10^(4) points/hm^(2). Planting density can be adjusted to meet the demand of harvesting fiber.