نتایج جستجو برای: 60 cm depths total n

تعداد نتایج: 2004638  

2017
Stephen L. Young Guy B. Kyser Jacob N. Barney Victor P. Claassen Joseph M. DiTomaso

In a 2-year field study, we quantified lateral root growth patterns and soil water depletion dynamics in the invasive annual Centaurea solstitialis and two native perennials, Elymus glaucus and Grindelia camporum. Centaurea solstitialis produced lateral roots most actively from early April to mid-June, during the late rosette to spiny seedhead stage while both root growth and water depletion we...

Journal: :Journal of environmental quality 2017
Biana H Kuwano Marco A Nogueira Cristiane A Santos Dáfila S L Fagotti Michele B Santos Luís E A M Lescano Diva S Andrade Graziela M C Barbosa João Tavares-Filho

Landfill leachates, which are potential pollutants, may also carry significant amounts of nutrients that can be recycled by plants. We assessed the nutritional status and yield of wheat ( L.) and properties of a Rhodic Kandiudult soil (depths of 0-10, 10-20, 20-40, and 40-60 cm) after 11 applications of landfill leachate over 4 yr. In the last application, wheat received 0, 32.7, 65.4, 98.1, or...

2013
Stephen L. Young Guy B. Kyser Jacob N. Barney Victor P. Claassen Joseph M. DiTomaso

In a 2-year field study, we quantified lateral root growth patterns and soil water depletion dynamics in the invasive annual Centaurea solstitialis and two native perennials, Elymus glaucus and Grindelia camporum. Centaurea solstitialis produced lateral roots most actively from early April to mid-June, during the late rosette to spiny seedhead stage while both root growth and water depletion we...

Journal: :علوم دامی ایران 0
حسین بلوچ قرایی کارشناس ارشد گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه تربیت مدرس، تهران، ایران. یوسف روزبهان دانشیار گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه تربیت مدرس، تهران، ایران. حسن فضائلی استاد و عضو هیأت علمی مؤسسۀ تحقیقات علوم دامی، کرج، ایران. جواد رضایی دانش آموختۀ دکتری گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه تربیت مدرس، تهران، ایران.

the present study was conducted to investigate the effects of deep-stacking process on temperature and pathogenic bacterial survival of broiler litter (bl). broiler litter, deep-stacked to 3 depths (30, 60 or 120 cm) and at 3 moisture levels (15, 25 or 35%) was made use of in a split plot design, experiment last for 21 days. daily temperature of the deep-stacked bl at different depths and at di...

Journal: :Journal of nematology 1990
R McSorley D W Dickson

Vertical distribution of five plant-parasitic nematodes was examined in two north Florida soybean fields in 1987 and 1988. Soil samples were collected from 0-15 cm, 15-30 cm, and 30-45 cm deep at each site. Soil at the three depths consisted of approximately 96% sand. More than 50% of Belonolaimus longicaudatus population densities occurred in the upper 15-cm soil layer at planting, but the spe...

2003
R. E. Muck

The effect of a surface open to air on the ensiling process was investigated in 15 × 60 cm PVC silos in four trials, three with alfalfa (30, 41, and 49% dry matter, DM) and one with whole-plant corn (35% DM). Silos were sampled 1, 2, 5, 7, 14, and 28 d post-filling at 5, 20, 35, and 50 cm from the open surface. At 5 cm, little fermentation occurred as oxygen contents were at 10% or higher, and ...

Journal: :پژوهش فیزیک ایران 0
رضا پورایمانی r puorimani university of arakدانشگاه اراک مرضیه مظلوم شهرکی m mazloom shahraki university of arakدانشگاه اراک

in this work, 137cs activity concentration of soil in five depths and in six meteorology stations in terms of bq/kg has been measured. for each thirty soil's samples, parameters such as kind of soil, density and hydraulic coefficient of transmission were determined. correlation coefficient between 137cs activity concentration and raining average, hydraulic coefficient of transmission and s...

Journal: :Journal of nematology 1991
T C Todd

The host efficiencies of corn, sorghum, soybean, and wheat were compared for a Kansas population of Belonolaimus sp. under greenhouse conditions. In a related field study conducted in 1989 and 1990, the responses of Belonolaimus sp. and Pratylenchus scribneri populations to eight cropping regimes were monitored at depths of 0-30 and 31-60 cm in sandy soil. With the exception of alfalfa, all cro...

Journal: :iran agricultural research 2008
h. kheyrodin h. antoun

the objective of this work was to study the effects of tillage and liquid manure applications on some physical and chemical properties as well as on the carbon and nitrogen mineralization potential of a meadow soil. our results indicated that tillage and manure applications had no effect on the concentration of cu, mn, total n and organic c in 0-15 cm layer of soil after 15 years of treatment. ...

Journal: :Journal of nematology 1976
B B Brodie

Population densities of Belonolaimus longicaudatus, Pratylenchus brachyurus, and Trichodorus christiei were determined from soil samples taken weekly in Tifton, Georgia during a 14-month period (except for April and May) at 15-cm increments to a depth of 105 cm. Belonolaimus longicaudatus predominately inhabited the top 30 cm of soil that was 87-88% sand, 6-7% silt, and 5-7% clay. No specimens ...

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