Enviromental behavior of sulfentrazone and fipronil in a Brazilian clayey latosol: field experiment and simulation

There has been an urgent need to assess pesticide environmental behavior under Brazilian field conditions and to evaluate the risks associated to its use in agriculture. Besides a qualitative and quantitative interpretation of field experiments to acquire understanding about pesticide environmental behaviour, field experiments are important to test pesticide fate models. Environmental behaviour of fipronil and sulfentrazone in a sugarcane area in Dourados, MS, was evaluated until 257 days after application. Moreover, the PEARL model was tested to simulate the fate of these two pesticides in the field. Soil samples for pesticide residue quantification and water content were taken at 0-10, 10-30, 30-50, 50-70 and 70-100 cm depth. There was a fast dissipation of both pesticides at soil surface within 15 days after application and their leaching was not beyond 30 cm depth. Dissipation and leaching satisfactory simulations for both pesticides were achieved only after calibration of half-life values or using a reduced initial dose. This study shows that fast dissipation of pesticides in the field can be an important process to consider when assessing the environmental behavior of pesticides in Brazil.

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A field perspective on effects of fire and temperature fluctuation on Cerrado legume seeds

Seed Science Research ◽

10.1017/s096025851700006x ◽

2017 ◽

Vol 27 (2) ◽

pp. 74-83 ◽

Cited By ~ 17

Author(s):

L. Felipe Daibes ◽

Talita Zupo ◽

Fernando A.O. Silveira ◽

Alessandra Fidelis

Keyword(s):

Temperature Fluctuation ◽

Field Experiments ◽

Seed Viability ◽

Soil Surface ◽

Temperature Fluctuations ◽

Fire Effects ◽

Fuel Load ◽

Physical Dormancy ◽

Legume Seeds ◽

Field Perspective

AbstractInformation from a field perspective on temperature thresholds related to physical dormancy (PY) alleviation and seed resistance to high temperatures of fire is crucial to disentangle fire- and non-fire-related germination cues. We investigated seed germination and survival of four leguminous species from a frequently burned open Neotropical savanna in Central Brazil. Three field experiments were conducted according to seed location in/on the soil: (1) fire effects on exposed seeds; (2) fire effects on buried seeds; and (3) effects of temperature fluctuations on exposed seeds in gaps and shaded microsites in vegetation. After field treatments, seeds were tested for germination in the laboratory, together with the control (non-treated seeds). Fire effects on exposed seeds decreased viability in all species. However, germination of buried Mimosa leiocephala seeds was enhanced by fire in an increased fuel load treatment, in which we doubled the amount of above-ground biomass. Germination of two species (M. leiocephala and Harpalyce brasiliana) was enhanced with temperature fluctuation in gaps, but this condition also decreased seed viability. Our main conclusions are: (1) most seeds died when exposed directly to fire; (2) PY could be alleviated during hotter fires when seeds were buried in the soil; and (3) daily temperature fluctuations in gaps also broke PY of seeds on the soil surface, so many seeds could be recruited or die before being incorporated into the soil seed banks. Thus seed dormancy-break and germination of legumes from Cerrado open savannas seem to be driven by both fire and temperature fluctuations.

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Technologies of drop irrigation of young almond garden on terraces in foothland conditions of the Kyzylsu-Yuzhnaya river basin

Melioration and Water Management ◽

10.32962/0235-2524-2021-1-12-15 ◽

2021 ◽

Vol 0 (1) ◽

pp. 12-15

Author(s):

Daler Domullodzhanov

Keyword(s):

River Basin ◽

Drip Irrigation ◽

Field Experiments ◽

Soil Surface ◽

Perennial Grasses ◽

Minimum Amount ◽

Almond Orchard

The article presents the results of field experiments on the study of the technology of drip irrigation of a young almond orchard on terraces with clear cover with tillage soil surface, with use of mulching and overseeding of perennial grasses. In the variant with mulching, the minimum amount of irrigation observed – 24, with the irrigation norm – 1904 litre per tree. In other cases, the number of irrigation events increases from 8 to 23, respectively, the irrigation norms are 1.39 and 2.06 times.

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Crop residues on short-term CO2 emissions in sugarcane production areas

Engenharia Agrícola ◽

10.1590/s0100-69162013000400009 ◽

2013 ◽

Vol 33 (4) ◽

pp. 699-708 ◽

Cited By ~ 5

Author(s):

Mariana M. Corradi ◽

Alan R. Panosso ◽

Marcílio V. Martins Filho ◽

Newton La Scala Junior

Keyword(s):

Co2 Emissions ◽

Field Experiments ◽

Crop Residues ◽

Soil Surface ◽

Dry Mass ◽

Agricultural Crop ◽

Short Term ◽

Sugarcane Production ◽

Soil Temperatures ◽

Production Areas

The proper management of agricultural crop residues could produce benefits in a warmer, more drought-prone world. Field experiments were conducted in sugarcane production areas in the Southern Brazil to assess the influence of crop residues on the soil surface in short-term CO2 emissions. The study was carried out over a period of 50 days after establishing 6 plots with and without crop residues applied to the soil surface. The effects of sugarcane residues on CO2 emissions were immediate; the emissions from residue-covered plots with equivalent densities of 3 (D50) and 6 (D100) t ha-1 (dry mass) were less than those from non-covered plots (D0). Additionally, the covered fields had lower soil temperatures and higher soil moisture for most of the studied days, especially during the periods of drought. Total emissions were as high as 553.62 ± 47.20 g CO2 m-2, and as low as 384.69 ± 31.69 g CO2 m-2 in non-covered (D0) and covered plot with an equivalent density of 3 t ha-1 (D50), respectively. Our results indicate a significant reduction in CO2 emissions, indicating conservation of soil carbon over the short-term period following the application of sugarcane residues to the soil surface.

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Do applications of sulfur or sulfate influence infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) in canola?

Canadian Journal of Plant Science ◽

10.4141/p01-081 ◽

2002 ◽

Vol 82 (3) ◽

pp. 599-610 ◽

Cited By ~ 4

Author(s):

L. M. Dosdall ◽

R. -C. Yang ◽

P. M. Conway

Keyword(s):

Brassica Rapa ◽

Field Experiments ◽

Elemental Sulfur ◽

Insect Pest ◽

Soil Surface ◽

Application Rate ◽

Delia Radicum ◽

Application Methods ◽

Root Maggot ◽

Sulfur Nutrition

While the importance of sulfur nutrition for the development of healthy stands of canola is well documented, the role of sulfur in the management of insect pest infestations has not previously been investigated in this crop. Field experiments were conducted at three sites in central Alberta in 1997 and 1998 to determine the influence of sulfur and sulfate applications on infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) in canola (Brassica rapa L.). Different formulations (granules, powder, prills, and sprays), application methods (either drilled in with the seed or top-dressed on the soil surface), and application rates were evaluated. To assess the degree of root maggot infestation, oviposition throughout the season and damage to taproots at the end of the season were monitored. Sulfur contents were analyzed from leaf samples collected mid-season and seed yields were measured from all treatment plots. Root maggot responses to the different sulfur treatments and application methods varied among years and sites, indicating that environmental factors have great importance in determining infestation levels by these pests, and the oxidation rate of elemental sulfur in soil. Sulfur formulation and application rate had significant effects on root maggot egg deposition and root damage for some sites and years, but even at high rates of application (112 kg ha-1) reductions in infestation levels were not substantial relative to the controls. While sulfur additions alone will not greatly reduce root maggot infestation levels in canola, growers should employ adequate sulfur nutrition for optimum crop health to enable plants to better compensate for damage by these pests. Key words: Brassica rapa, Delia radicum, Delia floralis, elemental sulfur, sulfate, canola

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DEGRADASI LAHAN PADA KEBUN CAMPURAN DAN TEGALAN DI KABUPATEN DHARMASRAYA

Jurnal Solum ◽

10.25077/js.4.1.5-9.2007 ◽

2007 ◽

Vol 4 (1) ◽

pp. 5

Author(s):

Syafrimen Yasin ◽

Gusnidar Gusnidar ◽

Dedy Iskandar

Keyword(s):

Land Use ◽

Soil Depth ◽

Soil Surface ◽

Soil Samples ◽

Imperata Cylindrica ◽

Undisturbed Soil ◽

Fertility Status ◽

Land Use Types ◽

Bulk Volume ◽

Soil Fertility Status

A research conducted in Sungai Rumbai, Dharmasraya Regency and in Soil Laboratory Andalas university was aimed to evaluate soil fertility status on the depth below 0-20 cm from several land use types , especially under Mixed Garden and annual cultivated dryland soil. Soil samples were taken on Ultisol at 0-8% slope (late-waving soil surface). Land use types evaluated were forest, annual cultivated dryland, bush land, rangeland covered by Imperata cylindrica and mixed garden. Composite soil samples for soil chemical analysis were taken on the 0-20 cm soil depth with four replications, and 5 drillings for each replication. Undisturbed soil samples by using sample ring were used to analyze sol bulk volume. The data resulted were compared to the criteria and were statistically tested using Analysis of Variance and then were continued by LSD at 5% level. From the results of analyses could be concluded that land use for mixed garden had the higher Organic Carbon (OC) content and the lower bulk volume (BV) than those for annual cultivated dryland soil.Key Words: Degradasi Lahan, Kebun Campuran, Tegalan

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Сортоиспытание моркови столовой в условиях Московской и Ростовской областей

Kartofel` i ovoshi ◽

10.25630/pav.2019.82.1.011 ◽

2019 ◽

Author(s):

L.A. Yusupova ◽

L.M. Sokolova ◽

A.V. Kornev ◽

A.N. Khovrin

Keyword(s):

Field Experiments ◽

Meteorological Conditions ◽

Moscow Region ◽

Qualitative And Quantitative ◽

Rostov Region ◽

Opposite Trend ◽

Quantitative Characteristics ◽

Variety Testing ◽

Domestic Breeding ◽

Qualitative And Quantitative Characteristics

Представлены результаты испытаний образцов моркови столовой в условиях Московской и Ростовской областей. Цель исследований – провести сортоиспытание моркови столовой в двух эколого-географических зонах и выявить различия по отдельным качественным и количественным признакам. Исследования проведены в 2017-2018 годах. Метеорологические условия 2017-2018 годов в Московской области (МО) складывались неблагоприятно для развития моркови в фазу «вилочки» и начала формирования корнеплодов. В Ростовской области жаркая и сухая погода в июле-августе отрицательно влияла на рост развитие корнеплодов. Материалом для исследований служили 3 сорта и 3 гибрида моркови столовой отечественной селекции: Корсар, Шантенэ королевская, Нанте, F1 Таврида, F1 Поиск 32, F1 Поиск 41. Полевые опыты были заложены согласно общепринятым методикам. Образцы значительно отличались по длине корнеплода: корнеплоды, выращенные в Ростовской области, имели большую длину, чем в Московской области, за исключением сорта Шантенэ королевская (11,9 и 13,2 см соответственно) и гибрида F1 Поиск 32 (18,4 и 15,8 см соответственно), у которых наблюдали обратную тенденцию. По урожайности сорта и гибриды, полученные в МО, значительно превосходили аналогичные образцы, выращенные в Ростовской области. На юге в течение двух лет испытаний лучше всех показал себя сорт Шантенэ королевская (55,0 и 54,9 т/га). В Московской области наибольшую урожайность показывал сорт Шантенэ королевская (75,0 и 69,5 т/га соответственно), гибриды F1 Поиск 32 (73,2 и 69,0 т/га), F1 Поиск 41 (69,0 и 64,7 т/га). Распространение листовых болезней в условиях Московской и Ростовской областей сводилось к тому, что в 2018 году по сравнению с 2017 годом образцы были более устойчивы, кроме гибридов F1 Таврида и F1 Поиск 41.The results of testing samples of carrots in the conditions of Moscow and Rostov regions are presented. The purpose of the research is to carry out a variety testing of carrots in two ecological-geographical zones and to identify differences in individual qualitative and quantitative characteristics. Research conducted in 2017-2018. The meteorological conditions of 2017–2018 in the Moscow Region (MO) were unfavorable for the development of carrots in the “fork” phase and the beginning of the formation of roots. In the Rostov region, hot and dry weather in July and August negatively influenced the growth of the development of roots. The material for research was 3 varieties and 3 carrot hybrids of the domestic breeding: Corsar, Shantene korolevskaya, Nante, F1 Tavrida, F1 Poisk 32, F1 Poisk 41. Field experiments were established according to generally accepted methods. The samples differed significantly in the length of the roots: roots grown in the Rostov region had a greater length than in the Moscow region, with the exception of the Shantene korolevskaya variety (11.9 and 13.2 cm, respectively) and the hybrid F1 (18.4 and 15.8 cm, respectively), which observed the opposite trend. In terms of yield, the varieties and hybrids obtained in the MO were significantly superior to similar samples grown in the Rostov region. In the south, during two years of testing, the Shantene korolevskaya variety (55.0 and 54.9 t/ha) performed best of all. In the Moscow region, the highest yield was shown by the variety Shantene korolevskaya (75.0 and 69.5 t/ha, respectively), hybrids F1 (73.2 and 69.0 t ha), F1 Poisk 41 (69.0 and 64. 7 t/ha). The spread of leaf diseases in the conditions of Moscow and Rostov regions was reduced to the fact that in 2018 compared to 2017, the samples were more stable, except for the F1 Tavrida and F1 Poisk 41.

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The Environmental Risk Assessment of Herbicide Anilofos on Various Chinese Cultivated Soils

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1786 ◽

2011 ◽

Vol 356-360 ◽

pp. 1786-1789 ◽

Cited By ~ 3

Author(s):

Yi Hua Liu ◽

Fu Bin Tang ◽

Guo Nian Zhu

Keyword(s):

Risk Assessment ◽

Environmental Risk ◽

Environmental Fate ◽

Glass Plate ◽

Soil Surface ◽

Soil Samples ◽

Adsorption Coefficient ◽

Leaching Behavior ◽

First Order ◽

First Order Kinetics

Anilofos is the organophosphorus herbicide widely used in China. However, little is known on the processes governing the environmental fate of anilofos in soils and its environmental risk for groundwater. Several environmental fate studies were performed concerning the degradation, sorption, photolysis and mobility of anilofos in soils. The degradation of anilofos in three Chinese soil samples followed first-order kinetics, with half-lives between 64.2 d-161.2 d. The adsorption coefficient (KF) values for the three soils were 10.67 (loam), 31.29 (clay) and 11.63 (sand). No notable photolysis of anilofos occurred on soil surface. Leaching tests, performed in manually packed soil glass-plate, indicated that anilofos moved very slowly on the three types of soil thin layer. Thus, the leaching behavior of anilofos coincided well with the results of the batch sorption and degradation experiments. The data generated from this study could be helpful for risk assessment studies of the pesticide in the environment.

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INFLUENCE OF CASSAVA (MANIHOT ESCULENTA) INTERCROP ON GROWTH AND FRUIT YIELDS OF PEPPER (CAPSICUM SPP.) IN SOUTH-WESTERN NIGERIA

Experimental Agriculture ◽

10.1017/s0014479706004200 ◽

2007 ◽

Vol 43 (1) ◽

pp. 79-95 ◽

Cited By ~ 5

Author(s):

F. O. OLASANTAN ◽

A. W. SALAU ◽

E. E. ONUH

Keyword(s):

Manihot Esculenta ◽

Field Experiments ◽

Radiant Energy ◽

Soil Surface ◽

Fruit Yield ◽

Earthworm Casts ◽

Area Index ◽

Growth Environment ◽

Premium Price ◽

Capsicum Spp

In tropical Africa, pepper (Capsicum spp.) is grown as a rainfed crop, and its production is limited by the long, hot growing season. Field experiments were conducted in Nigeria to evaluate the effects of cassava (Manihot esculenta) on the growth and yields of three pepper cultivars and gross returns in 2001–2003. In Experiment 1, pepper (cv. Sombo) was planted between rows of cassava cvs Idileru (PI), Odongbo (PO) and TMS 30572 (PT). In Experiment 2, pepper cvs Sombo, Tatase and Atarodo, were mixed with TMS 30572 (MS, MT or MA). The growth environment for the intercropped pepper differed from sole crops of pepper. Radiant energy reaching the soil surface, maximum diurnal soil and canopy temperatures, and weed growth were lower with intercropping, with the lowest values being observed in the PI and PT intercrops. Similarly, soil moisture content and the number of earthworm casts were greater with intercropping, with the highest values also occurring in the PI and PT intercrops. In both experiments, fresh fruit yields of pepper depended on the duration of harvest, the number of fruits per plant and the weight of fruits. In Experiment 1, although the number of fruits and fruit yield of cv. Sombo were greater in the sole crop (SP) than the PO intercrop, the fruit yields in the PI and PT intercrops were similar to those of the SP plot. In Experiment 2, the number of fruits and yield of intercropped pepper cvs Tatase, Sombo and Atarodo were 25–28 % higher, on average, than in pure stands. Cassava tuber yield was not affected by intercropped pepper in either experiment. Total gross returns were greater than growing either pepper or cassava in monoculture. Increased total gross returns in the intercrops were obtained in the PI and PT treatments and in the MS and MA treatments without a significant reduction in pepper fruit yield. By promoting early fruit set and harvest, and bearing in mind the cumulative gross returns, mixing pepper and cassava enhanced the value of the vegetable, as early fresh pepper fruits command a premium price. It is concluded that pepper can be grown between cassava rows to provide a suitable environment for growth, but that this depends on the cassava cultivar. Using the less tall early cassava cultivar, with a relatively moderate leaf area index in a mixture with pepper is therefore recommended.

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