As such it Bangladesh may be classified as wetland according to the offers a favourable environment for growth of aquatic definition enunciated in the Ramsar Convention [1]. Bodies of water in Bangladesh, therefore, are About 6. The major aquatic weeds of Bangladesh are Eich- percent experiences shallow inundation [2]. A total number of 20 aquatic weeds are found in this area and its surrounding belong to 11 families having 1 shrub, 2.
Materials and Methods 4 grasses and 15 herbs species. The farmers of wetland area usually start trict Figure 1 during October The area belongs to their land preparation for boro rice and rabi crops in the the agro-ecological zone of Low Ganges River Flood- Month of September-October after receding of flood wa- plain AEZ The climate of the area is subtropical. The farmers usually one 20SL at 2.
The active ploughing with country plough or power tiller. All treatments were laid out in a randomized com- physical removal of aquatic weeds due to the high bio- plete block design with three replications.
The plot size mass of these weeds. The aquatic weeds before land preparation is highly expen- treatments were applied on 5 October Site 1: Ma- sive, labor intensive and time consuming process.
These include: 2, 4-D, Acrolein, Bis- to land preparation having 5 - 7 cm standing water. The pyribac-sodium,Carfentrazone-ethyl, Coppers chelate, spray solution was made by mixing commercial product sulfate , Diquat, Endothall, Flumioxazin, Fluridone, of Gramoxone 20SL at 4 ml per litre water. Spraying was done clopyr [5]. Herbicidal control of aquatic weeds seems to with the support of a knapsack sprayer in a sunny day be a better option since it is an effective and fast acting along with good spray coverage to increase the efficacy.
Gramoxone 20SL Data on weed density and dry weight were taken from formulation of paraquat, manufactured by Syngenta, is each plot on 10 days after spraying. The weeds were used as a broad spectrum of weed control in a number of identified species-wise. Weeds were sampled with the crop and non crop areas for numerous years. Paraquat is help of quadrat method and recorded. The quadrat was a fast-acting, non-selective contact herbicide that is ab- placed at random in the unit plot and all the weeds within sorbed by the foliage.
After drying weight of each foliage [7]. Using paraquat for aquatic weed control en- sample were taken. Relative weed density RWD , rela- minating the need for manual removal of aquatic weeds tive weed biomass RWB and weed control efficiency in monocropped wetland areas before preparing fields WCE of different treatments were calculated with the for boro rice or rabi crops.
The major weed was described by [8]. Partial economic analysis was There were 8 different emergent weed species infesting the field among which the most dominant weed species were Eichhornia crassipes , Pistia stratiotes , Enhydra fluctuans , Monochoria vaginalis , Echinochloa crus-galli. The results revealed that, weed control efficiency was significantly affected by different herbicidal treatments.
The treatments, Gramoxone 20SL at 2. Application of non - selective herbicide Gramoxone 20SL at 2. Nishat, et al. Mamun, M. Salim, M. Wahab and M. Ahmed, M. Bhuiyan, C.
Study the effects of herbicides on citrus trees. Compared to contact herbicides , systemic herbicides pose a greater risk of phytotoxicity to trees. Jerusalem - : Experiments on weed control in citrus groves. In : Weed control in citrus groves and phytotoxity of herbicides to citrus trees ; a progress report on work carried out during Chemical weed control in citrus groves.
Continental Breakfast — Sponsored by Dunavant a. Lowell J. Zelinski a. Session 2: Cotton Agronomy — Dr. Zelinski Growth and development, irrigation scheduling, plant growth regulators. Shop, Wine and Dine Tour a. Session 2 continued : Indepth discussion of cotton nutrition and fertility a. Session 3: Pest Management Review - p. Cotton Insect and Weed Management — Dr. Zelinski - p. Diseases and Nematodes Dr. Bob Hutmacher, Extension Specialist - U.
Shafter REC presiding - p.
0コメント