scholarly journals Nutrient Uptake and Solute Movement in Drip Irrigated Summer Peppers

1969 ◽  
Vol 69 (1) ◽  
pp. 63-68
Author(s):  
C. L. Santiago ◽  
M. R. Goyal
Keyword(s):  
Puerto Rico ◽  
Research And Development ◽  
Nutrient Uptake ◽  
Agricultural Research ◽  
Growing Season ◽  
Soil Samples ◽  
Southern Coast ◽  
Agricultural Research And Development ◽  
Solute Movement ◽  
Development Center

A study on nutrient uptake (N, P, K, Ca and Mg) by peppers (var. Cubanelle) and fertilizer solute movement in relation to dripper location was conducted in the semiarid southern coast of Puerto Rico at the Fortuna Agricultural Research and Development Center. Soil samples were taken 9, 64, and 118 days after transplanting from each location, with three 15-cm depth increments and three 15-cm horizontal increments away from the dripper. These samples were analyzed for pH, EC, P, K, Ca, and Mg. All fertilizer was applied via drip irrigation. Factorial analysis indicated that solute movements at different positions were not statistically different. The relationships between nutrient uptake versus days after transplanting were of Mitscherlich's curve type. Greatest amount of nutrient uptake occurred during the last third part of the growing season, and followed an order of K > N > Ca > P > Mg.

scholarly journals Evaluation of Eight Alfalfa Cultivars in a Cumulic Haplustolls of Southern Puerto Rico

1969 ◽  
Vol 68 (2) ◽  
pp. 121-130
Author(s):  
J. Vélez-Santiago ◽  
J. A. Arroyo-Aguilú ◽  
F. Fuentes ◽  
A. Torres
Keyword(s):  
Puerto Rico ◽  
Research And Development ◽  
Medicago Sativa ◽  
Crude Protein ◽  
Agricultural Research ◽  
First Year ◽  
Agricultural Research And Development ◽  
Calcium And Magnesium ◽  
Phosphorus And Potassium ◽  
Development Center

Herbage and crude protein yields of 8 non-hardy alfalfa (Medicago sativa) cultivars under irrigation were evaluated at the Fortuna Agricultural Research and Development Center during 1980-1981. First year yields were excellent and ranged from 26,453 to 32,660 kg/ha in 343 days. The best performance (yield and persistence) was obtained with Hayden PX-1, Florida 66, Mesa Sirsa, and UC-163. Yields were highest during the months of April, May, and June, and lowest during August. In 1981, yields were lower and ranged from 13,060 to 19,534 kg/ha in 218 days. The cultivars with the highest forage and crude protein yields during the 10 cuttings in 1980, were also highest during the 7 cuttings in 1981. After 17 cuttings, the persistence of Mesa Sirsa, Florida 66, Tanhuato, Hayden PX-1, and UC-163 was 87, 85, 77, 76, and 65%, respectively. Mean crude protein, phosphorus, potassium, calcium, and magnesium contents for the 1980 cuttings were 21.5, 0.37, 3.44, 1.47, and 0.29%, respectively; for the 1981 cuttings, mean crude protein, phosphorus, and potassium contents were 23.2, 0.35, and 3. 11%, respectively.

scholarly journals Variable Reaction of Tomato Lines to Bacterial Wilt Evaluated at Several Locations in Southeast Asia

HortScience ◽  
1996 ◽  
Vol 31 (1) ◽  
pp. 143-146 ◽  
Author(s):  
Peter M. Hanson ◽  
Jaw-Fen Wang ◽  
Olivia Licardo ◽  
Shook Ying Mah ◽  
Glen L. Hartman ◽  
...  
Keyword(s):  
Research And Development ◽  
Bacterial Wilt ◽  
Agricultural Research ◽  
Field Trials ◽  
Kuala Lumpur ◽  
Inoculation Method ◽  
Agricultural Research And Development ◽  
The Tropics ◽  
Disease Pressure ◽  
Development Center

Bacterial wilt (BW), caused by Pseudomonas solanacearum E.F. Smith, is one of the most destructive disease of tomato (Lycopersicon esculentum Mill.) in the tropics. Twenty tomato lines/accessions previously identified as BW-resistant were evaluated for BW reaction in fields providing high disease pressure at Subang, Indonesia; Los Baños, Philippines; Malaysian Agricultural Research and Development Institute (MARDI), Kuala Lumpur; Asian Vegetable Research and Development Center (AVRDC), Taiwan; and Taiwan Seed Improvement and Propagation Service (TSIPS). Entries also were tested in the greenhouse at the AVRDC with a P. solanacearum strain from Taiwan (Pss4) using a drench inoculation method. Objectives of the study were to identify stable sources of BW resistance for southeast Asian tomato breeding programs, and to determine the correlation between field and greenhouse reactions. Mean entry survival was 21.6% at Subang, 31.9% at Los Baños, 76.7% at the AVRDC, 93.6% at Malaysia, and 93.3% at TSIPS, indicating that most entries were resistant at MARDI and the Taiwan locations but susceptible at Subang and Los Baños. L285 (mean survival = 83.8%) and CRA 84-58-1 (mean survival = 79.4%) were the most resistant entries in the field trials. Mean survival (70.1%) of CRA 66-derived entries was significantly better than the mean of entries with resistance derived from UPCA 1169 or UPCA 1169 plus `Venus' or `Saturn'. Mean survival of AVRDC entries bred in the 1980s (59.4%) was significantly greater than mean survival of AVRDC lines bred in the 1970s (45.7%). The correlation between entry BW percent survival averaged over the five field trials and entry means from drench inoculation in the greenhouse was highly significant (r = 0.70), suggesting that the drench inoculation method is effective in selection for BW resistance.

scholarly journals Control of Northern Masked Chafer Larvae on Turfgrass, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 368-368
Author(s):  
K. T. Power ◽  
D. J. Shetlar ◽  
H. D. Niemczyk ◽  
M. G. Belcher
Keyword(s):  
Research And Development ◽  
Environmental Conditions ◽  
Agricultural Research ◽  
Kentucky Bluegrass ◽  
Weed Species ◽  
Supplemental Irrigation ◽  
Annual Bluegrass ◽  
Plot Analysis ◽  
Agricultural Research And Development ◽  
Development Center

Abstract The study was conducted on a research lawn at the Ohio Agricultural Research and Development Center, Wooster, Ohio. Insecticides were applied 21 Aug to plots 10 X 10 ft arranged in a RCB replicated four times. Liquid treatments were applied with a CO2 sprayer and Teejet™ 8010VS nozzles at 35 psi pressure that delivered a volume of 3 gal/1000 ft2. The granular treatments were applied with a shaker jar. After all treatments were applied, the area was irrigated with approximately ‘A inch of water bul received no further supplemental irrigation. Environmental conditions at the time of treatment were as follows: NMC—approximately 17/ft2, 100% second instars; turf—level, dry, 2½ inches ht, 60% Kentucky bluegrass and 30% annual bluegrass, 10% weed species, no thatch; soil—moist, 79°F at 1 inch and 77°F at 3 inches deep; weather—mostly sunny, 80°F, 0-5 mph wind. Evaluation on 1 Oct involved counting the number of live NMC and JB larvae in each of six 7X7 inch areas per plot. Analysis of variance was done on plot totals and means were separated by LSD test at P = 0.05.

scholarly journals PENGELOLAAN TANAMANTERPADU (PTT) PADI SAWAH DI LOKASI PRIMA TANI

Agro Ekonomi ◽  
2010 ◽  
Vol 17 (2) ◽  
Author(s):  
Rusdin Rusdin ◽  
Suharno Suahrno
Keyword(s):  
Research And Development ◽  
System Approach ◽  
Review Paper ◽  
Agricultural Research ◽  
Cropping System ◽  
Growing Season ◽  
Rice Productivity ◽  
Central Java ◽  
Agricultural Research And Development ◽  
Farmer Income

The review paper on application of the Integrated Cropping System (ICS) has been accomplished. The objective of this study was to identify this system relate to the increasing of rice productivity and farmer's income. Indonesian Agency of Agricultural Research and Development (IAARD) has released and developed the integrated cropping system approach which could improve productivity and farmer's wealth. Results on tria plot in Southeast Sulawesi revealed that ICS could increased the productivtty around 48,57 - 80,30 %/ha/growing season otherwise improving income around Rp. 2,40 - 2,47 million/ha/growing season. The simmiler results were showed in some other provinces such as Bante, Maluku, NTB Central Java, and West Java which ICS could increased the productivity around 0,33 - 82,7 % or improving farmer income around Rp. 0,4 - 3,5 millions/ha/growing. 

scholarly journals Forage production of nine alfalfa cultivars in the semiarid region of Puerto Rico

1969 ◽  
Vol 72 (2) ◽  
pp. 221-230
Author(s):  
Luis E. Tergas ◽  
Jaime Vélez-Santiago ◽  
Doralissa Vera de Saldaña
Keyword(s):  
Puerto Rico ◽  
Crude Protein ◽  
Agricultural Research ◽  
Semiarid Region ◽  
Forage Production ◽  
Agronomic Practices ◽  
Overhead Irrigation ◽  
Agricultural Research And Development ◽  
Calcium And Magnesium ◽  
Development Center

Dry forage production of alfalfa (Medicago sativa) cultivars with overhead irrigation was determined by cutting every 30 to 35 days for 3 years (1983-85) at the Fortuna Agricultural Research and Development Center. Florida 66 and 77, and a mixture of these two cultivars, produced highest yields with mean annual dry forage (DF) of 25.38, 28.86 and 26.96 ton/ha, respectively. Raidor and ARC were the least productive cultivars, with means of 15.40 and 16.27 ton DF/ha, respectively. Forage production per cutting was inversely related to rainfall, highest yields were obtained with irrigation during the dry season. Mean crude protein, phosphorus, potassium, calcium and magnesium contents for all cuttings were 20.2, 0.40, 4.54, 1.39 and 0.38%, respectively. Results confirm that it is feasible to grow alfalfa for hay on well drained Cumulic Haplustolls in the southern coast with well adapted cultivars and proper agronomic practices.

Tolerance of Processing Tomato (Solanum lycopersicum) Varieties to Halosulfuron-methyl

2017 ◽  
Vol 31 (3) ◽  
pp. 430-435 ◽  
Author(s):  
Mohsen Mohseni-Moghadam ◽  
Douglas Doohan
Keyword(s):  
Research And Development ◽  
Solanum Lycopersicum ◽  
Field Experiments ◽  
Agricultural Research ◽  
Yield Reduction ◽  
Processing Tomato ◽  
Herbicide Treatments ◽  
Agricultural Research And Development ◽  
Significant Yield ◽  
Development Center

Field experiments were conducted at the Ohio Agricultural Research and Development Center in Wooster, OH in 2002 and 2004 to evaluate the tolerance of tomato varieties to halosulfuron-methyl, a selective herbicide used for POST control of broadleaf weeds and nutsedge (Cyperus). POST herbicide treatments included halosulfuron-methyl at 0, 34.7 and 70 gaiha−1. Plots were evaluated at 1, 3, and 6 wk after treatment (WAT), and yield was recorded at the end of the season. Minimal crop injury was observed 1 and 3 WAT in plots treated with both halosulfuron-methyl rates only in 2002. Although the crop recovered from herbicide injury when treated with the lower rate at 6 WAT, ‘Ohio 8245’, ‘M82’, and ‘E6203’ showed injury at this interval when treated with halosulfuron-methyl at 70 g ha−1. No injury was observed with either rates in 2004. No significant yield reduction was observed in any of the varieties in the test plots. These results indicate that differential tolerance to halosulfuron-methyl does not exists among these tomato varieties with the exception of E6203 and M82.

Distributional Weights in Benefit-Cost Analysis: Examples from Rwanda and Uganda

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Charles B. Moss ◽  
Andrew Schmitz
Keyword(s):  
Developing Countries ◽  
Cost Analysis ◽  
Research And Development ◽  
Agricultural Research ◽  
Systematic Variation ◽  
Policy Makers ◽  
Benefit Cost Analysis ◽  
Small Producer ◽  
Agricultural Research And Development ◽  
Benefit Cost

Abstract The question of how to allocate scarce agricultural research and development dollars is significant for developing countries. Historically, benefit/cost analysis has been the standard for comparing the relative benefits of alternative investments. We examine the potential of shifting the implicit equal weights approach to benefit/cost analysis, as well as how a systematic variation in welfare weights may affect different groups important to policy makers. For example, in the case of Rwandan coffee, a shift in the welfare weights that would favor small coffee producers in Rwanda over foreign consumers of Rwandan coffee would increase the support for investments in small producer coffee projects. Generally, changes in welfare weights alter the ordering for selecting investments across alternative projects.

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