نتایج جستجو برای: 30 cm and 30 cm then

تعداد نتایج: 16915215  

2016
K. B. ESSER

Hardpans (plough/hoe pans) are commonly believed to restrict plant root growth and crop yields under conventional small-scale agriculture in sub-Saharan Africa. This study questions the notion of widespread hardpans in Zambia and their remedy under conservation tillage. Soil penetration resistance was measured in 8x12 grids, covering 80 cm wide and 60 cm deep profiles in 32 soil pits. Large and...

2010
HALIMAH MUHAMAD TAN YEW ISMAIL SAHID NASHRIYAH MAT

A study on the leaching of chlorpyrifos in an oil palm agro ecosystem was conducted in an oil palm plantation in Sepang, Selangor. The insecticide chlorpyrifos was sprayed using a knapsack sprayer at the recommended and double the recommended dosage. Soil samples were collected at different depths, viz. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm at the following intervals: -1 day (befor...

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...

2016
Pu Shen Zhengfeng Wu Chunxiao Wang Sheng Luo Yongmei Zheng Tianyi Yu Xuewu Sun Xiushan Sun Caibin Wang Xinhua He

Tillage intensities largely affect soil compaction dynamics in agro-ecosystems. However, the contribution of tillage intensities on compaction changes in underground peanut (Arachis hypogaea) fields has not been quantified. We thus aimed to better understand the role of soil tillage intensities in mitigation of compaction stress for peanuts. Using three field tillage experiments in major Chines...

Journal: :Journal of nematology 1981
C C Mishra M C Dash

Ecological studies on soil nematodes were made in a tropical rice field and pasture. Parasitic species were more diversified in the pasture than in the rice field. Eighty-six and sixty percent of total nematodes occurred in the top 10 cm in rice field and pasture, respectively. Nematodes were not randomly or uniformly dispersed but aggregated. Parasitic forms were most abundant and correlated w...

Journal: :Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 2016
Camila Chevonica Vandresen Alan Guilherme Gonçalves Diogo Ricardo Bazan Ducatti Fabio Seigi Murakami Miguel Daniel Noseda Maria Eugenia Rabello Duarte Sandra Mara Woranovicz Barreira

Photodynamic inactivation (PDI) is an efficient approach for the elimination of a series of microorganisms; however, PDI involving phytopathogenic filamentous fungi is scarce in the literature. In the present study, we have demonstrated the photoinactivating properties of five cationic meso-(1-methyl-4-pyridinio)porphyrins on conidia of the phytopathogen Colletotrichum graminicola. For this pur...

Journal: :Acta Agriculturae Scandinavica Section B-soil and Plant Science 2023

The use of grazing management strategies can influence canopy structure and the permanence legumes. objective this work was to evaluate determination forage heights as a strategy regarding herbage mass composition tiller population dynamics in multispecies pastures comprising Megathyrsus maximus cv. Aruana legumes Macrotyloma axillare, Calopogonium mucunoides Stylosanthes spp. Four treatments, ...

Journal: :Journal of applied physiology 2004
Shawn E Soutiere Wayne Mitzner

Maximal lung volume or total lung capacity in experimental animals is dependent on the pressure to which the lungs are inflated. Although 25-30 cm H2O are nominally used for such inflations, mouse pressure-volume (P-V) curves show little flattening on inflation to those pressures. In the present study, we examined P-V relations and mean alveolar chord length in three strains (C3H/HeJ, A/J, and ...

Journal: :Journal of neurophysiology 2010
Andrew A G Mattar David J Ostry

Studies on generalization show the nature of how learning is encoded in the brain. Previous studies have shown rather limited generalization of dynamics learning across changes in movement direction, a finding that is consistent with the idea that learning is primarily local. In contrast, studies show a broader pattern of generalization across changes in movement amplitude, suggesting a more ge...

Journal: :FEMS microbiology letters 2012
Yu Wang Guibing Zhu Harry R Harhangi Baoli Zhu Mike S M Jetten Chengqing Yin Huub J M Op den Camp

The anaerobic ammonium-oxidizing (anammox) and nitrite-dependent anaerobic methane-oxidizing (n-damo) bacteria in a paddy soil core (0-100 cm) were investigated with newly designed primers targeting the hydrazine synthase β-subunit (hzsB) of anammox bacteria and the recently published primers targeting the pmoA and 16S rRNA genes of n-damo bacteria. The hzsB gene was identified as a proper biom...

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