|
It could restrain the qrowth of many species of bushes and weeds, the multipli- cation of which competed with that of Pinus tabulaeformis, for about з years by the foliar application of Krenite, Ammonium ethyl carbamoylphosphonate. The heig- ht increment had increased by about 25%; the diameter 20% with proper dosage, which comes to 2.4Kg/ha, for the type of forest floor of which Lespedeza bicolor. forsythia suspcusa, Carex duriuscola and Aster tripoliam constituted. The most suitable season meets from... It could restrain the qrowth of many species of bushes and weeds, the multipli- cation of which competed with that of Pinus tabulaeformis, for about з years by the foliar application of Krenite, Ammonium ethyl carbamoylphosphonate. The heig- ht increment had increased by about 25%; the diameter 20% with proper dosage, which comes to 2.4Kg/ha, for the type of forest floor of which Lespedeza bicolor. forsythia suspcusa, Carex duriuscola and Aster tripoliam constituted. The most suitable season meets from the end of May to the middle of July. Other advantages are as follows: preventing soil erosion, protecting the forest floor and environment, as it has no poisonousness. Economically, both expenses and labour power economized to a quite certain extent. The application of Krenite would have broad prospect in forest production. 叶面喷施调节膦一次能在三年内显著地抑制灌木杂草的滋生,同时,目的树种——油松的生长得到了促进。在适宜剂量下,其高生长量增加25%,地径增加20%左右。就本林区所代表的植被类型而言,调节膦的用量以2.4公斤/公顷较为适宜。不论在五月底还是七月中旬喷药,均有明显效果。此外,用调节膦化控代替人工抚育,还能大幅度节约劳力,减少抚育费用。同时,该项措施能有效地保护植被,防止水土流失;该药品没有毒性,不污染环境。因此,作为一项新的幼林抚育技术,将在林业生产中具有宽广的前途。 On the basis of previous plot experiments,the fosamine,using the best dosage (2.4Kg/ha),was applied in about 5 ha of Pinus Tabulaeformis young forest, and its effects were compared with manual culture. It was observed that soraying fosamine could restrain the growth of many species of bushes and weeds,decreased their coverdegree,and increased the growth of pines.It was discovered that the effective time to control the bushes and weeds with manual culture was shorter than the application of fosamine.After... On the basis of previous plot experiments,the fosamine,using the best dosage (2.4Kg/ha),was applied in about 5 ha of Pinus Tabulaeformis young forest, and its effects were compared with manual culture. It was observed that soraying fosamine could restrain the growth of many species of bushes and weeds,decreased their coverdegree,and increased the growth of pines.It was discovered that the effective time to control the bushes and weeds with manual culture was shorter than the application of fosamine.After two monthes of manual culture the cover degreeofbushes and weeds had in creased from 30% to 70%,and to 90% in next May. Besides,the height increament of pines sprayed with fosamine was greater than the manual culture obyiously. All these results offered the basis for the application of fosamine in forest production in big scale in the future. 在以往小区对比试验的基础上,将调节膦的最佳剂量(2.4公斤/公顷)在5公顷左右面积的油松幼林中进行中间试验,并对喷药与人工抚育的效果作了比较。小区试验中所观察到的喷施调节膦后连续三年灌木杂草受抑制,灌木杂草的复盖度降低及油松生长量增加等现象,在本试验中得到了重复。同时也证明,人工抚育所能有效地控制灌木杂草的时间要比喷施调节膦短得多。在人工抚育后二个月,灌木杂草的复盖度即从30%上升为70%,到次年五月上升为90%。此外喷药后油松高生长的增加量亦比人工抚育的要大得多。这些结果为今后林业生产中大规模地采用调节膦进行幼林抚育提供了依据。 In planting poplars, big plant and space are usually needed. So it needs to pay high cost for manual and mechanical work, In order to enhance level of overall management, agricultural crops could be intercropped on the plantation, from which economic effect can be obtained. Chemical weeding can not only culture crops without ploughing, but it needn't weed particularly for the plantation.The writers got some results by intercropping soybean and using Trefluralin. Treflan in 1982. When medicinal volume used... In planting poplars, big plant and space are usually needed. So it needs to pay high cost for manual and mechanical work, In order to enhance level of overall management, agricultural crops could be intercropped on the plantation, from which economic effect can be obtained. Chemical weeding can not only culture crops without ploughing, but it needn't weed particularly for the plantation.The writers got some results by intercropping soybean and using Trefluralin. Treflan in 1982. When medicinal volume used was 3kg/ha, the weeding effect on monoeotydons was 99.4% on dicotyledons was 98.4% and the total effect was 87%. Specially, weeding effect on E. Crusgalli was 99.6%. The information from agriculture research organization showed that the production of soybean field used Trefluralin was increased by 15%—20% and competing water and fertilization with trees was reduced.Based on the data, the writer found that tree height increased by40% and tree diameter growth increased by 8% compared with the comparisons. So, the use of chemical weeding by Trefuralin is good for both forest and agriculture, 营造杨树人工林多是采用大株行距,抚育时需要较高的人工或机械费用。为了提高综合经营水平,在行间种植农作物可以实现多条渠道经济收益。在株、行间进行化学灭草又可以使农作物免耕,林地也不需要单独进行锄草。在杨树人工林行间种大豆施氟乐灵(Trefluralin. Treflan)进行灭草,1982年在本所试验地中测得的施药量3kg/ha(商品量)灭单子叶杂草效果99.4%,双子叶98.4%、总防效83%。特别是灭稗草(E.Crusgalli)效果可达99%—99.6%。根据农业科研单位提供资料施用氟乐灵在大豆田间灭草可使数量提高15%—20%。由于杂草减少,与树木争水争肥的现象也减少。根据1982年在杨树人工林试验地测得平均高生长量与对照区相比增加4%,平均胸径生长量与对照区相比增加8%。杨树人工林施用氟乐灵灭草是林农一举双得的好措施。
|