scholarly journals Effect of Harvesting Sugarcane at 12, 14, and 16 Months of Age Upon Yields at Isabela, P.R.

1969 ◽  
Vol 57 (1) ◽  
pp. 1-8
Author(s):  
S. Alers-Alers ◽  
Frank Juliá ◽  
M. A. Lugo-López
Keyword(s):  
Puerto Rico ◽  
Statistical Analysis ◽  
Field Experiment ◽  
Split Plot ◽  
Plot Design

The data presented in this paper were obtained from a field experiment conducted at Isabela in northwestern Puerto Rico, employing a split plot design in which the age of the sugarcane at harvest (12, 14, and 16 months) was tested in the main plots and eight varieties in the subplots. The varieties were: P.R. 980, P.R. 1117, P.R. 1140, P.R. 1166, P.R. 1148, P.R. 1152, P.R. 1165, and P.R. 1158. Four replications were used. A statistical analysis of the data revealed that higher sugar yields were obtained when the cane was harvested at 16 rather than at 14 or 12 months of age under the conditions prevailing at Isabela and irrespective of variety. Yields also were higher at 14 than at 12 months. These differences were highly significant.

scholarly journals Critical time for weed removal in dicamba tolerant soybean as influenced by pre emergence herbicides

2020 ◽  
Vol 29 (1) ◽  
pp. 55-62
Author(s):  
Darko Jovanović ◽  
Ivan Cuvaca ◽  
Jon Scott ◽  
Stevan Knežević
Keyword(s):  
Field Experiment ◽  
Growth Stage ◽  
Critical Time ◽  
Split Plot ◽  
Main Plot ◽  
Plot Design ◽  
Weed Removal

Field experiment was conducted in 2019 at Haskell Agriculture Laboratory, Concord, NE, USA. Goal of the study was to test the influence of PRE-EM herbicides on the Critical Time for Weed Removal (CTWR) in dicamba-tolerant soybean. The study was arranged in a split-plot design which consisted of four herbicide regimes as main plot treatments and seven weed removal timings as subplot treatments, with four replications. The herbicide regimes included: (1) no PRE and glyphosate, (2) acetochlor and dicamba as PRE and glyphosate as POST, (3) acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and (4) acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST. The five weed removal times included the V1, V3, V6, R2 and R5, and there were also weedy and weed-free season long plots. By utilizing herbicide regimes, the CTWR was delayed to 632 GDD (until V4 soybean growth stage, 28 days after emergence) for acetochlor and dicamba as PRE and glyphosate as POST, 861 GDD (until V6 soybean growth stage, 32 days after emergence) for acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and 1060 GDD (until R1 soybean growth stage, 42 days after emergence) for acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST.

scholarly journals An Attempt to Evaluate the Effect of Varying Time Intervals Between Liming and Cropping on an Oxisol

1969 ◽  
Vol 65 (2) ◽  
pp. 83-89
Author(s):  
J. Badillo-Feliciano ◽  
M. A. Lugo-López
Keyword(s):  
Puerto Rico ◽  
Yield Components ◽  
Field Experiments ◽  
Time Interval ◽  
Time Intervals ◽  
Split Plot ◽  
Significant Yield ◽  
Field Beans ◽  
Plot Design

Field experiments were conducted on an Oxisol with pH 5.0 in northwestern Puerto Rico in an attempt to determine whether the time interval between liming and cropping affected yields, yield components, and other plant characters. Six lime-cropping interval treatments were tested with two cultivars of succeeding crops of field beans and corn in a split plot design. Two cultivars were used as indicator crops in each case. The liming-cropping intervals ranged from planting immediately after liming to planting 10 months after liming (liming on a bimonthly basis). No significant yield differences attributable to treatments could be detected for either crop. In the same fashion, no significant differences were obtained on the various yield components and plant characters studied except for the fact that the 27R fieldbeans from plots limed 10 months prior to planting were smaller than those from plots limed just before planting. The effectiveness of liming Oxisols with pH 5.0 seems not to depend on the time interval that elapses between liming and planting.

scholarly journals Sugarcane Production for 12-, 18-, and 24-Month Cycles Under Conditions in Puerto Rico

1969 ◽  
Vol 54 (1) ◽  
pp. 110-127
Author(s):  
S. Alers-Alers ◽  
M. A. Lugo-López ◽  
R. Gandía Caro
Keyword(s):  
Puerto Rico ◽  
Management Practices ◽  
Field Experiments ◽  
Crop Management ◽  
Total Sugar ◽  
Statistical Analyses ◽  
Sugarcane Production ◽  
Sugarcane Varieties ◽  
Split Plot ◽  
Plot Design

The data presented in this paper are from field experiments conducted at Corozal and Barceloneta following a split plot design where sugarcane cropping cycles or age at harvest (12-, 18-, and 24-month) were the main plots and varieties were the subplots. The varieties studied were: P.R. 1028, P.R. 1016, P.R. 1013, P.R. 980, P.R. 975 and B. 4362. Six replications were used. Statistical analyses of the data revealed that under the conditions prevailing in Puerto Rico, with the sugarcane varieties now available, and under typical current soil and crop management practices, 12- and 18-month canes are more efficient sugar producers than 24-month cane. More cane tonnage and more total sugar per acre per month were obtained during the short cycles than during the 24-month cycle.

scholarly journals Dry Matter Production and Nitrogen Uptake as Influenced by Irrigation and Nitrogen Levels in Maize

2021 ◽  
pp. 155-161
Author(s):  
B. Soujanya ◽  
B. Balaji Naik ◽  
M. Uma Devi ◽  
T. L. Neelima ◽  
Anima Biswal
Keyword(s):  
Field Experiment ◽  
Nitrogen Uptake ◽  
Dry Matter ◽  
Agricultural Research ◽  
Irrigation Scheduling ◽  
Physiological Maturity ◽  
Nitrogen Levels ◽  
Maturity Stages ◽  
Split Plot ◽  
Plot Design

A field experiment was conducted at Agro Climate Research Center, Agricultural Research Institute, P.J.T.S Agricultural University, Rajendranagar, Hyderabad, India during rabi 2019-20. The field experiment was laid out in a split plot design with three replications. The treatments comprising of three irrigation scheduling based on (Depletion of Available Soil Moisture) at 60% DASM, 40% DASM and 20% DASM as main plots and three nitrogen levels viz., 90, 180 and 240 kg N ha-1 as sub-plots. The experiment was laid out in split plot design. The results indicated that, among the different treatment combinations, the crop irrigation scheduled at 20 % DASM in conjunction with 240 kg N ha-1 accumulated significantly more dry matter of 34.2 g, 149.2 g, 233.7 g and 284.8 g plant-1, at 6th leaf, silking, dough and physiological maturity stages, respectively. The nitrogen uptake was found to be more when the crop was irrigated at 20 % DASM in conjunction with 240 kg N ha-1 (67.1 g, 231.8 g, 294.7 g and 305.3 g plant-1) at 6th leaf, silking, dough and physiological maturity stages, respectively.

scholarly journals Barnyard Millet (Echinochloa frumentacea) Varieties Performance under Different Fertility Levels in Rainfed Conditions of Garhwal Himalaya, India

2020 ◽  
pp. 102-106
Author(s):  
Ajay Kumar ◽  
Arunima Paliwal ◽  
. Shikha ◽  
Radhey Shyam ◽  
S. B. Singh
Keyword(s):  
Field Experiment ◽  
Garhwal Himalaya ◽  
Recommended Dose ◽  
Barnyard Millet ◽  
Kharif Season ◽  
Rainfed Conditions ◽  
Split Plot ◽  
Two Factors ◽  
Echinochloa Frumentacea ◽  
Plot Design

A field experiment was conducted during Kharif season of 2017-18 at the College of Forestry, V.C.S.G. Uttarakhand University of Horticulture and Forestry, Ranichauri, Tehri Garhwal, Uttarakhand, India to study the effect of fertility levels on different high yielding cultivars of barnyard millet under rainfed conditions of hills of Uttarakhand. The experiment consisted of two factors viz. variety and fertilizer. The experiment had three fertility levels viz. 75% RDF (Recommended Dose of Fertilizer), 100% RDF and 125% RDF and four varieties viz. VL249, DHBMV23-3, VL172 and VL207. Total experiment has twelve treatment combinations. The three fertility levels were laid out in main plots and four varieties were in sub-plots of split plot design along with three replications. The results indicated that VL249 was the most economical high yielding cultivar of barnyard millet at 100% of the recommended dose of fertilizer with higher B:C ratio of 1.92 for rainfed conditions of Garhwal hills.

scholarly journals Aplikasi Pupuk NPK Dan Bokashi Serta Interaksinya Terhadap Pertumbuhan Dan Produksi Tiga Varietas Ubi Kayu (Manihot escculenta. L) Di Kutai Timur

2017 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Ratna Shanti ◽  
Ratna Nirmala
Keyword(s):  
Field Experiment ◽  
Local Varieties ◽  
Local Variety ◽  
Tuber Production ◽  
Split Plot ◽  
Plot Design

The purpose of this study to determine the effect of fertilization on the production of three varieties of cassava that is Darul Hidayah, Gajah and Varietas Local. The field experiment was conducted for 9 months starting from April to December 2016. Locations trial in Sangata Selatan, DistrictKutai Timur.The design is split plot design arranged in a factorial treatment was repeated 3 times (R) Treatment Varieties (V) as the main plots and fertilizer treatments (P) as subplot. The results showed that the inorganik  fertilizer (NPK), organik  (Bokashi) and combinations thereof capable of producing tubers each, 124 tons per hectares, 130.44 tons per hectares, and 134.67 tons per hectares and 99.11 ton per hectares as a kontrol s. Fertilization treatment of three varieties cassava tubers can increase production 20%. 23.8% and 26% respectively as a compared with kontrol s. While the tuber production between varieties Darul Hidayah and Gajah 148.50 tons perhectares and 132, 33 ton per hectares while the local variety 85.33 tons per hectares. The increase in the tubers from 3 varieties namely 42.5% and 35.6% compared to local varieties. Keywords: anorganik  and organik  fertilizers, varieties of cassava

Thermal energy utilization in mungbean (Vigna radiata L.) as influenced by sowing times and genotypes

2019 ◽  
Author(s):  
A.K. Dhaka ◽  
Karmal Singh ◽  
Satish Kumar ◽  
Bhagat Singh ◽  
J.K. Bhatia ◽  
...  
Keyword(s):  
Field Experiment ◽  
Thermal Energy ◽  
Vigna Radiata ◽  
Energy Use ◽  
Energy Utilization ◽  
Yield Attributes ◽  
Kharif Season ◽  
Split Plot ◽  
Main Plot ◽  
Plot Design

Field experiment was conducted to study the thermal energy utilization in mungbean as influenced by sowing times and genotypes during Kharif season of 2014 and 2016 at Research farm of CCS Haryana Agricultural University, Hisar, India. Experiment was laid out in split plot design with four main-plot treatments of sowing times (2nd fortnight of June, 1st fortnight of July, 2nd fortnight of July and 1st fortnight of August) and four sub-plot treatments comprised of genotypes (MH 421, Basanti, Sattya and MH 318). The results indicated that yield and yield attributes, phenology, agro-meteorological indices (GDD, HTV, HYTV, PTU and PAR) and yield based thermal energy use efficiencies (HUE, HTUE, HYTUE, PTUE and RUE) were significantly influenced by sowing times and genotypes. Early sowing (2nd fortnight of June) of mungbean was found more suitable and recorded significantly higher yield and thermal energy use efficiencies. Among the genotypes MH 318 was recorded with maximum thermal use efficiencies followed by MH 421.

scholarly journals Variation in Reproductive Efficiency of Groundnut (Arachis hypogea L.) Genotypes at Different Planting Densities

2021 ◽  
Vol 9 (3) ◽  
pp. 91-96
Author(s):  
M. Swetha Sree ◽  
Keyword(s):  
Field Experiment ◽  
Reproductive Efficiency ◽  
Plant Spacing ◽  
Kharif Season ◽  
Arachis Hypogea ◽  
Pod Yield ◽  
Planting Geometry ◽  
Agricultural College ◽  
Split Plot ◽  
Plot Design

A field experiment was conducted during kharif season, 2018 and 2019 at S.V. Agricultural college, Tirupati to study the ‘Variation in reproductive efficiency of groundnut (Arachis hypogea L.) genotypes at different planting densities’. Instant increase in groundnut yields can be achived by reorienting its planting geometry. However identification of right variety with right plant architechture which fits into closed spacings is reduced. The experiment was laid out in split plot design with twelve treatments and three groundnut varities Kadiri 6, Kadiri 9 and Dharani with four spacings (S1: 30X10 cm, S2: 30X5 cm, S3: 20X10 cm and S4: 20X5 cm). Among the Spacings 20X10 cm (50 plants m-2) recorded significantly higher (3,616.87 kg ha-1) followed by 20x5cm (3,157.07 kg ha-1) and significantly lower pod yields in 30x10 cm (2,904.87 kg ha-1) and recommended spacing 30X5cm (2,540.07 kg ha-1). Among the three varieties Decumbent-3, Dharani recorded highest pod yield (3403.48 kg ha-1) followed by Decumbent-2 type, kadiri-9 (3292.65 kg ha-1) and least by Erect type, Kadiri-6 (2467.94 kg ha-1). However genotype performance was varied with the spacings adopted Kadiri-6 performed better under recommended spacing only (30x10 cm). Kadiri-9 variety also showed decreased yields when plant to plant to plant spacing was reduced. However Dharani recorded higher flower to peg ratio, peg to pod ratio and yields even in plant to plant and row to row spacings were reduced. Hence, to increase the groundnut productivity Dharani can be recommended at a spacing of 20x10 cm (50 plants m-2).

Reducing Vehicle Fuel Consumption and Delay at Signalized Intersections: Controlled-Field Evaluation of Effectiveness of Infrastructure-to-Vehicle Communication

2017 ◽  
Vol 2621 (1) ◽  
pp. 10-20 ◽  
Author(s):  
Mohammed Hamad Almannaa ◽  
Hao Chen ◽  
Hesham A. Rakha ◽  
Amara Loulizi ◽  
Ihab El-Shawarby
Keyword(s):  
Field Experiment ◽  
Fuel Consumption ◽  
Audio Signal ◽  
Field Evaluation ◽  
Signalized Intersections ◽  
Current Signal ◽  
Recommendation Algorithm ◽  
Vehicle Communication ◽  
Split Plot ◽  
Plot Design

This paper presents the results of a controlled-field experiment designed to evaluate the efficiency of a speed recommendation algorithm developed to reduce vehicle fuel consumption at signalized intersections. The evaluated algorithm received instantaneous speed data from the vehicle and computed real-time fuel-efficient speeds that were promptly communicated by an audio signal to the driver to follow. The controlled-field experiment included two other scenarios for comparison. In the first scenario, participants drove freely through the intersection (no communication between the vehicle and the infrastructure). In the second scenario, the time remaining for the current signal indication was communicated to the driver by an audio signal. The experiment was designed as a split-split-plot design in which the scenarios served as the plots, the grade (downhill or uphill) as the split plot, and the time-to-red indication offset (10, 15, 20, and 25 s) as the split-split plot. In total, 1,536 trips were conducted by 32 participants (16 females and 16 males) between the ages of 18 and 30. The collected data were compared in relation to fuel economy and travel time over a fixed 430-m distance (250 m upstream of the intersection and 180 m downstream). The statistical analysis showed significant differences between the evaluated scenarios. The developed optimal speed advisory algorithm was found to be efficient in reducing fuel consumption, with savings up to 19%, depending on the grade and red indication offset. In addition, the developed speed advisory algorithm was found to reduce travel times by up to 10%.

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