The root rot is a major disease affecting yield of Gentiana macrophyl a pal , reducing yield or even causing total crop failure. This research introduced the occurrence characteristics and various control techniques o...The root rot is a major disease affecting yield of Gentiana macrophyl a pal , reducing yield or even causing total crop failure. This research introduced the occurrence characteristics and various control techniques of root rot of Gentiana macrophyl a pal , in order to provide references for farmers.展开更多
It was hypothesized that wood chips can serve as a mulch to improve the growth of young trees by facilitating the development of their root systems, inhibiting weed germination, and suppressing weed growth. The presen...It was hypothesized that wood chips can serve as a mulch to improve the growth of young trees by facilitating the development of their root systems, inhibiting weed germination, and suppressing weed growth. The present study was carried out in Ghorogh Nursery, Golestan Northern Iran, in order to investigate the impact of wood chips applica- tion on root growth of oak （Quercus castaneifolia） seedlings and control of weed. A three centimeter wood chip layer was used on the soil surface as the mulch treatment with bare soil as the control. The number of new roots, the length of exciting roots and the density of weeds were meas- ured after 5 and 12 weeks. Results showed that wood chip application had significant positive effect on the length of excising roots after 5 and 12 weeks compared with control seedlings. Also, weeds were reduced to near zero levels in treated plot. Our findings suggested that wood chip layer on the soil surface in the nursery can conserve soil moisture and prevent nutrient leaching from the rooting zone as well as diminish weed growth which consequently lead to production of high quality seedling.展开更多
Single or mixed use ofAgaricus bisporus residue and microbial agent had better control effect on cucumber root-knot nematode disease in greenhouse. The results showed that the control effect of single use of A. b/spor...Single or mixed use ofAgaricus bisporus residue and microbial agent had better control effect on cucumber root-knot nematode disease in greenhouse. The results showed that the control effect of single use of A. b/sporus residue was 32.9% - 34.7%, and the yield increasing rate was 2.1% - 8.7% ; the control effect of mixed use ofA. b/sporus residue and microbial agent was 59. 1% - 63. 6%, and yield increasing rate was 2.6% - 3.5%. The experimental dose had no ad- verse effects on soil physical and chemical properties. The mixed use of A. b/sporus residue and microbial agent was one of the effective ways to control root-knot nematode disease.展开更多
Kiwifruit root rot is an important root disease of kiwifruit, which has occurred increasingly in recent years. The disease leads to the death of whole kiwifruit plant under severe condition, and has become an importan...Kiwifruit root rot is an important root disease of kiwifruit, which has occurred increasingly in recent years. The disease leads to the death of whole kiwifruit plant under severe condition, and has become an important disease restricting kiwi fruit industry development. The characteris-tics, occurrence, etiology and symptoms of kiwifruit root rot were introduced in the paper, and the prevention and control technology against the dis-ease were put forward from the aspects of agriculture, biology and chemistry.展开更多
In this paper, an algorithm designed by the author is used to construct the general solution to difference equations with constant coefficients. It is worth noting that the algorithm does not require any information o...In this paper, an algorithm designed by the author is used to construct the general solution to difference equations with constant coefficients. It is worth noting that the algorithm does not require any information on the multiple roots of the characteristic equation. This means one does not need to reconfigure the algorithm when changing the multiplicity groups. It is for this reason that the algorithm is called “universal”. In the present study, we solve the task of finding a linear optimal control for linear stationary discrete one- and higher-dimensional systems with scalar control. Moreover, we give analytical expressions for the control that minimize the quadratic criterion and ensure the asymptotic stability of the closed system. The obtained optimal control depends only on the parameters of the initial system and the roots of the characteristic equation.展开更多
为中药材根腐病的生物防治提供有效的生防种质资源,本文从1万多株细菌中通过平板拮抗法筛选获得3株对镰刀菌抑菌活性较强的根际细菌LHJS2-2、LHQS2-5和YHQS2-7,对尖孢镰刀菌F.oxysporum295、腐皮镰刀菌F.solaniN18和轮枝镰刀菌F.vertici...为中药材根腐病的生物防治提供有效的生防种质资源,本文从1万多株细菌中通过平板拮抗法筛选获得3株对镰刀菌抑菌活性较强的根际细菌LHJS2-2、LHQS2-5和YHQS2-7,对尖孢镰刀菌F.oxysporum295、腐皮镰刀菌F.solaniN18和轮枝镰刀菌F.verticillium173的抑菌带为12~17mm,对串珠镰刀菌F.moniliforme N19的抑菌带是3~5 mm。经形态观察、生理生化试验及16S r DNA鉴定结果表明,菌株LHJS2-2为短小芽胞杆菌B.pumilus,菌株LHQS2-5为贝莱斯芽胞杆菌B.velezensis,菌株YHQS2-7为深褐芽胞杆菌B.atrophaeus。盆栽试验结果表明,菌株LHJS2-2、LHQS2-5和YHQS2-7对黄芪根腐病的预防效果分别是88.07%、85.66%和76.73%,显著促进黄芪、黄芩、银柴胡幼苗株高、根长、地上部生物量和地下部生物量。田间试验结果表明,菌株LHJS2-2、LHQS2-5和YHQS2-7对黄芪根腐病的防治效果分别为41.37%、40.13%和41.95%,对党参根腐病的田间预防效果分别达到87.06%、95.03%和87.06%。菌株LHJS2-2、LHQS2-5和YHQS2-7对中药材根腐病的生物防治具有重要的前景。展开更多
文摘The root rot is a major disease affecting yield of Gentiana macrophyl a pal , reducing yield or even causing total crop failure. This research introduced the occurrence characteristics and various control techniques of root rot of Gentiana macrophyl a pal , in order to provide references for farmers.
文摘It was hypothesized that wood chips can serve as a mulch to improve the growth of young trees by facilitating the development of their root systems, inhibiting weed germination, and suppressing weed growth. The present study was carried out in Ghorogh Nursery, Golestan Northern Iran, in order to investigate the impact of wood chips applica- tion on root growth of oak （Quercus castaneifolia） seedlings and control of weed. A three centimeter wood chip layer was used on the soil surface as the mulch treatment with bare soil as the control. The number of new roots, the length of exciting roots and the density of weeds were meas- ured after 5 and 12 weeks. Results showed that wood chip application had significant positive effect on the length of excising roots after 5 and 12 weeks compared with control seedlings. Also, weeds were reduced to near zero levels in treated plot. Our findings suggested that wood chip layer on the soil surface in the nursery can conserve soil moisture and prevent nutrient leaching from the rooting zone as well as diminish weed growth which consequently lead to production of high quality seedling.
基金Supported by Edible Fungus Industry Innovation Team Projects of Shandong Agricultural Industry Research System(SDAIT-11-011-08)
文摘Single or mixed use ofAgaricus bisporus residue and microbial agent had better control effect on cucumber root-knot nematode disease in greenhouse. The results showed that the control effect of single use of A. b/sporus residue was 32.9% - 34.7%, and the yield increasing rate was 2.1% - 8.7% ; the control effect of mixed use ofA. b/sporus residue and microbial agent was 59. 1% - 63. 6%, and yield increasing rate was 2.6% - 3.5%. The experimental dose had no ad- verse effects on soil physical and chemical properties. The mixed use of A. b/sporus residue and microbial agent was one of the effective ways to control root-knot nematode disease.
基金Supported by Key Laboratory of Characteristic Fruit Resources Research and Utilization in Liupanshui(5202020170203)College Students Program of Liupanshui Normal University(LPSSY-DXS17054)
文摘Kiwifruit root rot is an important root disease of kiwifruit, which has occurred increasingly in recent years. The disease leads to the death of whole kiwifruit plant under severe condition, and has become an important disease restricting kiwi fruit industry development. The characteris-tics, occurrence, etiology and symptoms of kiwifruit root rot were introduced in the paper, and the prevention and control technology against the dis-ease were put forward from the aspects of agriculture, biology and chemistry.
文摘In this paper, an algorithm designed by the author is used to construct the general solution to difference equations with constant coefficients. It is worth noting that the algorithm does not require any information on the multiple roots of the characteristic equation. This means one does not need to reconfigure the algorithm when changing the multiplicity groups. It is for this reason that the algorithm is called “universal”. In the present study, we solve the task of finding a linear optimal control for linear stationary discrete one- and higher-dimensional systems with scalar control. Moreover, we give analytical expressions for the control that minimize the quadratic criterion and ensure the asymptotic stability of the closed system. The obtained optimal control depends only on the parameters of the initial system and the roots of the characteristic equation.
文摘为中药材根腐病的生物防治提供有效的生防种质资源,本文从1万多株细菌中通过平板拮抗法筛选获得3株对镰刀菌抑菌活性较强的根际细菌LHJS2-2、LHQS2-5和YHQS2-7,对尖孢镰刀菌F.oxysporum295、腐皮镰刀菌F.solaniN18和轮枝镰刀菌F.verticillium173的抑菌带为12~17mm,对串珠镰刀菌F.moniliforme N19的抑菌带是3~5 mm。经形态观察、生理生化试验及16S r DNA鉴定结果表明,菌株LHJS2-2为短小芽胞杆菌B.pumilus,菌株LHQS2-5为贝莱斯芽胞杆菌B.velezensis,菌株YHQS2-7为深褐芽胞杆菌B.atrophaeus。盆栽试验结果表明,菌株LHJS2-2、LHQS2-5和YHQS2-7对黄芪根腐病的预防效果分别是88.07%、85.66%和76.73%,显著促进黄芪、黄芩、银柴胡幼苗株高、根长、地上部生物量和地下部生物量。田间试验结果表明,菌株LHJS2-2、LHQS2-5和YHQS2-7对黄芪根腐病的防治效果分别为41.37%、40.13%和41.95%,对党参根腐病的田间预防效果分别达到87.06%、95.03%和87.06%。菌株LHJS2-2、LHQS2-5和YHQS2-7对中药材根腐病的生物防治具有重要的前景。
