SPRAYER SPEED AND VENTURI–NOZZLE EFFECTS ON BROADCAST APPLICATION UNIFORMITY

2001 ◽  
Vol 44 (6) ◽  
Author(s):  
A. Womac ◽  
R. Etheridge ◽  
A. Seibert ◽  
D. Hogan ◽  
S. Ray
Keyword(s):  
Broadcast Application ◽  
Venturi Nozzle

scholarly journals Control of Lepidopterous Larvae on Collard, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 91-91
Author(s):  
J. V. Edelson ◽  
M. Peters ◽  
J. Duthie ◽  
W. Roberts
Keyword(s):  
Experimental Design ◽  
Larval Abundance ◽  
Hollow Cone ◽  
Broadcast Application

Abstract Collard seed was planted in Mar at the AREC, Lane, OK. The experimental design was a RCB with 4 replicates and 9 treatments. Plots were 2 rows wide (72 inches) and 20 ft long with 20 ft alleys cut between plots. Plots were treated with insecticides using a CO2-powered backpack sprayer with a broadcast application of 72 inches from 4 hollow-cone nozzles applying 33 gal/A at 40 psi. Plots were treated on 4, 8, and 14 Jul. Plots were surveyed to determine larval abundance on 7, 11, and 17 Jul by examining 3 plants per plot and recording all larvae present.

scholarly journals Assessments of Ultra-Low-Cost Venturi Nozzle in Undergraduate Engineering Classes

2015 ◽  
Author(s):  
Arshan Nazempour ◽  
Paul Golter ◽  
Cecilia Richards ◽  
Robert Richards ◽  
Bernard Van Wie
Keyword(s):  
Low Cost ◽  
Undergraduate Engineering ◽  
Venturi Nozzle

Management of fertilizer nitrogen for direct-sown, rainfed lowland rice (Oryza sativa L.)

1988 ◽  
Vol 110 (3) ◽  
pp. 475-479 ◽  
Author(s):  
D. Panda ◽  
R. N. Samantaray ◽  
S. Patnaik
Keyword(s):  
Single Dose ◽  
Management Practices ◽  
Field Experiments ◽  
N Uptake ◽  
Split Application ◽  
Band Placement ◽  
Flood Water ◽  
Broadcast Application ◽  
Ammonium N ◽  
Coated Urea

SummaryField experiments were conducted in wet seasons (June-December) for 4 years on a clay loam Haplaquept, to study the effects of different N management practices on yield, urea and ammonium-N in flood water and N nutrition of an clite rice cv. CR 1009, grown in rainfed lowlands. During the first 3 years of the experiment, fertilizer management practices like band placement of neem-cake-coated urea (NCU), broadcast application of sulphur-coated urea (SCU) at sowing, or point placement of urea supergranules (USG) 3 weeks after germination at 40 kg N/ha gave grain yields of 3·1–3·4 t·ha, which were almost equal to that of split application of prilled urea (PU). In the 4th year of the experiment, besides NCU and USG, single dose applications of PU as band placement, incorporation in the soil at sowing or broadcast incorporation of soil-treated urea at early tillering was also found to have similar effect on grain yield and N uptake as split application of PU. The flood water of the treatment receiving broadcast application of PU at tillering contained some urea and ammonium N, which rapidly decreased to negligible amounts in 3·4 days.The results suggest that, depending upon the feasibility, any one of the single dose application methods at sowing time or 3 weeks after germination may be adopted in this system of rice culture, which avoids top-dressing of PU to surface flowing flood water of greater depths at later stages of crop growth.

scholarly journals Gafsa rock phosphate and triple superphosphate for dry matter production and P uptake by corn

2005 ◽  
Vol 62 (2) ◽  
pp. 159-164 ◽  
Author(s):  
Rossini Mattos Corrêa ◽  
Clístenes Williams Araújo do Nascimento ◽  
Silvana Keely de Sá Souza ◽  
Fernando José Freire ◽  
Gleibson Barbosa da Silva
Keyword(s):  
Dry Matter ◽  
Rock Phosphate ◽  
P Uptake ◽  
Production Costs ◽  
Dry Matter Production ◽  
Triple Superphosphate ◽  
Broadcast Application ◽  
Matter Production ◽  
Plant P Uptake ◽  
Corn Plants

Crops in general make poor use of phosphorous fertilizer and, as a result, recommended rates and production costs are very high. Phosphorus can be made more readily available to plants by proper management of phosphate fertilization, selecting both, type of fertilizer and application method. This study was carried out to evaluate the efficiency of the natural Gafsa rock phosphate and the triple superphosphate on dry matter production and P uptake by corn plants cultivated in a greenhouse. Fertilizers were applied localized and broadcast/incorporated on to two soils with contrasting phosphorus capacity factors (PCF). Rock phosphate broadcast application was as efficient as triple superphosphate in increasing corn plant dry matter in the Tropudult, with lower PCF. This effect was not observed on the Haplustox, owing to the lower P solubility due to the higher Ca concentration in this soil. Triple superphosphate rates increased plant P uptake in both soils and for both application forms. Rock phosphate resulted in higher P-content in plants, but only for broadcast application on the Ultisol.

scholarly journals Fertilizer for Sweet Pepper Under Drip Irrigation in an Oxisol in Northwestern Puerto Rico

1969 ◽  
Vol 65 (2) ◽  
pp. 123-128
Author(s):  
J. C. W. Keng ◽  
T. W. Scott ◽  
M. A. Lugo-López
Keyword(s):  
Drip Irrigation ◽  
Nutrient Management ◽  
Irrigation System ◽  
Sweet Pepper ◽  
Dry Season ◽  
Low Fertility ◽  
Wet Season ◽  
Promising Alternative ◽  
Broadcast Application ◽  
K Fertilizer

A drip irrigation system using porous plastic tubing was designed to study operational techniques of drip irrigation and fertilizer management in a highly weathered, leached, relatively low fertility, acid Oxisol. Sweet pepper (Capsicum annuum) was the test crop. All plots received an initial broadcast application of a 10-4.4-8.3 N-P-K fertilizer at the rate of 80 kg/ha. The experiment followed a randomized complete block layout with 4 treatments and 6 replications. The treatments were as follows: 1) N and K injected into the drip system, P banded; 2) banded N, P and K with drip irrigation; 3) broadcast N, P and K with drip irrigation; and 4) control-drip irrigation, no N, P and K other than the initial overall broadcast application. All treatments, except the control, received a total of 56.8 g of a 10-10-10 fertilizer per plant and all were uniformly drip irrigated according to pan evaporation data. Two crops were grown: one in the dry season and one in wet season. Yields were significantly different among all treatments for the dry season crop, with a high of 82.62 kg/ha for the treatments where Nand K were injected into the drip system and a low of 31.54 kg/ha for the control. For the wet season crop, no significant yield differences were found when fertilizer was injected into the drip system and when banded, but both these treatments were superior in yield to that of broadcast. These three treatments were superior to the control, with more than 100% increase. Drip irrigation is a promising alternative to currently used water-nutrient management methods for Oxisols in the wet-dry tropics.

scholarly journals Nucleation of super-critical carbon dioxide in a venturi nozzle

2016 ◽  
Vol 310 ◽  
pp. 69-82 ◽  
Author(s):  
D. Jarrahbashi ◽  
S.R. Pidaparti ◽  
D. Ranjan
Keyword(s):  
Carbon Dioxide ◽  
Venturi Nozzle ◽  
Critical Carbon Dioxide

Numerical study of flow field characteristics of Venturi nozzle for chemical laser

2011 ◽  
Vol 23 (5) ◽  
pp. 1225-1228
Author(s):  
靳冬欢 Jin Donghuan ◽  
刘文广 Liu Wenguang ◽  
陈星 Chen Xing ◽  
陆启生 Lu Qisheng ◽  
赵伊君 Zhao Yijun
Keyword(s):  
Flow Field ◽  
Numerical Study ◽  
Chemical Laser ◽  
Flow Field Characteristics ◽  
Venturi Nozzle

scholarly journals Use of limestone and agricultural gypsum in cauliflower crop management and clubroot control in mountain farming

2020 ◽  
Vol 42 ◽  
pp. e42494
Author(s):  
Carlos Antônio dos Santos ◽  
Margarida Goréte Ferreira do Carmo ◽  
Aline da Silva Bhering ◽  
Evandro Silva Pereira Costa ◽  
Nelson Moura Brasil do Amaral Sobrinho
Keyword(s):  
Soil Fertility ◽  
Crop Management ◽  
Biomass Accumulation ◽  
Base Saturation ◽  
Root Volume ◽  
Broadcast Application ◽  
Application Method ◽  
Aluminum Ions

The effects of the dose and application method of limestone - broadcast or in furrow - and of agricultural gypsum on soil fertility, the control of clubroot, and cauliflower development in mountain farming areas were evaluated. Initially, four doses of broadcast limestone (0.0, 1.0, 2.0, and 4.0 Mg ha-1) and two cauliflower cultivars (Sharon and Piracicaba Precoce) were analyzed. A second experiment evaluated limestone (4.0 Mg ha-1) application treatments: broadcast and in furrow, broadcast limestone + gypsum (3.0 + 1.0 Mg ha-1), and broadcast gypsum (1.0 Mg ha-1). Soil fertility was improved, and significant increases were observed in the total and healthy root volume with increasing doses of limestone. With 4.0 Mg ha-1, a 58 and 85% increase in yield was observed in Sharon and Piracicaba, respectively, compared to the control. Treatments with limestone and limestone + gypsum, regardless of the application method, elevated pH (≥ 10%), base saturation (V%) (≥ 37%), and calcium (Ca) contents (≥ 100%), and reduced the levels of aluminum ions (Al3+) (≥ 60%) and clubroot severity (≥ 64%) and favored biomass accumulation (≥ 27%) and yield (≥ 9.2%). The application of limestone in the furrow yielded results similar to the broadcast application.

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