scholarly journals Factors Affecting Herbicidal Activity of Imazosulfuron against Weeds in Paddy Fields.

1998 ◽  
Vol 43 (3) ◽  
pp. 195-202 ◽  
Author(s):  
Yasushi Tanaka ◽  
Takahiro Yamawaki ◽  
Harutoshi Yoshikawa
Keyword(s):  
Herbicidal Activity ◽  
Paddy Fields ◽  
Factors Affecting

Factors Affecting the Herbicidal Activity of TCA on Green Foxtail

Weed Science ◽  
1972 ◽  
Vol 20 (2) ◽  
pp. 172-176 ◽  
Author(s):  
Paul N. P. Chow
Keyword(s):  
High Temperature ◽  
Light Intensity ◽  
Sodium Salt ◽  
Trichloroacetic Acid ◽  
High Light ◽  
Herbicidal Activity ◽  
Setaria Viridis ◽  
Factors Affecting ◽  
Leaf Stage ◽  
Green Foxtail

Growth of green foxtail (Setaria viridis (L.) Beauv.) was effectively controlled in the greenhouse by applying the sodium salt of trichloroacetic acid (TCA) as a postemergence treatment, when a rate of 0.84 kg/ha was used; when application preceded the two-leaf stage; and when 2.54 mm of water were available daily for moving TCA into the soil. There were significant interactions of TCA rate with light intensity, temperature, and source of seeds on the response of green foxtail. Seedhead production was curtailed at rates of 0.56 kg/ha or above when plants were grown under high light intensities (19,250 to 22,000 lux) and at moderate temperatures (20 to 22 C). Rates of 1.68 kg/ha or more were required to stop heading of foxtail grown at high temperature (27 C).

scholarly journals 601 An Evaluation of Sulphosate and Four Glyphosate Formulations on Conifers

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 550E-551
Author(s):  
Larry Kuhns ◽  
Tracey Harpster
Keyword(s):  
Active Ingredient ◽  
New Product ◽  
Application Rate ◽  
Herbicidal Activity ◽  
White Pine ◽  
Factors Affecting ◽  
Fraser Fir ◽  
Time Of Application ◽  
White Fir ◽  
Glyphosate Formulations

Though glyphosate is considered to be a nonselective herbicide, conifer growers have long known that under certain conditions, they could contact the lower branches of their trees with the herbicide Roundup without injuring them. Species, time of application, rate of application, surfactant, method of application, and pruning wounds are all factors affecting conifer tolerance to glyphosate. Because Roundup was widely used by conifer growers, they were very concerned when the formulation of Roundup was changed to contain a more active surfactant. The new product was marketed under the name Roundup Pro. This change increased its herbicidal activity and raised the possibility that it could damage trees if applied in the same way as Roundup. To determine the tolerance of conifers grown in the northeast to a variety of glyphosate formulations, and sulfosate, a set of studies was established. Roundup, Roundup Pro, Glyfos, Accord, and Sulfosate were all applied to field grown hemlock, white fir, Canaan fir, fraser fir, douglas fir, Colorado spruce, and eastern white pine. Rates of 1 to 3 lb active ingredient/A were applied in the fall after new growth was hardened off. In general, it was found that the risk of injuring trees with Roundup Pro is greater than with the old formulation of Roundup. However, in all cases in which Roundup Pro caused more injury than Roundup, the Roundup Pro was applied at 3 lb active ingredient/A. This rate is double the rate recommended for this use. In calibrated, directed spray applications at 1.5 lb active ingredient/A or less, Roundup Pro should be safe for use around the species tested after their growth has fully hardened in the fall.

scholarly journals Factors Affecting the Salinity Intrusion at the Paddy Field in Thua Thien Hue Province, Vietnam

2021 ◽  
Author(s):  
Nguyen Phuc Khoa ◽  
Nguyen Thanh Dien ◽  
Nguyen Huu Ngu ◽  
Hoang Dinh Trung
Keyword(s):  
Paddy Field ◽  
Global Climate ◽  
Soil Samples ◽  
Paddy Fields ◽  
Salinity Intrusion ◽  
Factors Affecting ◽  
Shrimp Pond ◽  
The Status ◽  
Water And Soil Samples ◽  
Major Factors

Background: Several coastal regions in Vietnam have been suffered from salinity intrusion as a consequence of global climate change. However, there are limited studies on saline intrusion in Vietnam. This paper aimed to investigate the salinity intrusion of water and soil samples in paddy fields along Tam Giang lagoon, Thua Thien Hue province and clarify the factors affecting the salinity level. Methods: We measured the salinity concentrations (EC, Electrical conductivity) of water and soil samples in paddy fields at different distances (400, 600, 800, 1000 and 1200 m) from Tam Giang lagoon. The multiple regression analysis was performed to figure out the factors affecting the salinity concentrations. Result: The salinity concentrations of water were assessed as 48% high saline (10-25 dS m-1), 34% moderately saline (2-10 dS m-1), 2% slightly saline (0.7-2 dS m-1) and 15% non-saline ( less than 0.7 dS m-1). As for surface soil in paddy field, 14.3% moderately saline (4-8 dS m-1), 35.4% slightly saline (2-4 dS m-1) and 50.3% non-saline (0-2 dS m-1) were measured. A significantly positive correlation was found between salinity concentrations of water and soil (n = 175, r = 0.886, p less than 0.01). The distances from salinity sources, Tam Giang lagoon and shrimp pond, were major factors affecting the salinity concentrations. The paddy fields near Tam Giang lagoon and shrimp pond have higher salinity concentrations compared to those areas close to the residential area. The surface water in the paddy field within 1000 m from the salinity source was assessed as saline that might harm the paddy soil and rice production. The results of this study provide highly useful information for local policymakers and farmers about the status of salinity intrusion in paddy land.

scholarly journals The Determinants of Paddy Field Conversion in Timor Island, East Nusa Tenggara Province (NTT)

Agro Ekonomi ◽  
2017 ◽  
Vol 28 (2) ◽  
pp. 309
Author(s):  
Prischa Lulan ◽  
Dwidjono Hadi Darwanto ◽  
Slamet Hartono
Keyword(s):  
Paddy Field ◽  
High Growth ◽  
Least Square ◽  
Paddy Fields ◽  
Infrastructure Development ◽  
Factors Affecting ◽  
Ordinary Least Square ◽  
South Central ◽  
Building Area ◽  
Field Area

The objectives of this research are: (1) to investigate the trend of paddy fields on Timor Islandand (2) to know the determinants of the conversion of paddy fields on Timor Island. TimorIsland consists of several districts such as Kupang District, South Central Timor District(TTS), North Central Timor District (TTU), Belu District and Kupang City. In fact, theyare the main rice-producing areas in the Timor Island, so they have an important role in thesupplying sufficient for locals. However, the regions are slowly started to be converted tonon-paddy-field use such as new settlements and other infrastructure development along withthe current economic development. The basic method used in this research was descriptiveanalysis and the location of research was determined purposively because this locationwas based on the consideration that there was a high growth of non-agricultural sectors inTimor Island; making it vulnerable to the reduction of paddy field area. The data used wassecondary data (2005-2014). The results showed that (1) the trend of rice field in Timor Islandis not significant with time variable. (2) The analysis of determinants of paddy field area inTimor Island using multiple linear regression with Ordinary Least Square (OLS) methodindicated that the factors affecting the conversion of wetland in Timor Island significantlyare the variable of building area and the number of industries.

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