scholarly journals Determination of Crop Co-efficient Values for Jute (Corchorus olitorius L.)

2018 ◽  
Vol 16 (02) ◽  
pp. 115-122 ◽  
Author(s):  
AJ Milla ◽  
AR Akanda ◽  
SK Biswas ◽  
MA Uddin
Keyword(s):  
Agricultural Research ◽  
Crop Coefficient ◽  
Irrigation Scheduling ◽  
Climatic Conditions ◽  
Growth And Yield ◽  
Growth Stages ◽  
Crop Evapotranspiration ◽  
Initial Development ◽  
Fiber Yield

Site specific calibration of crop coefficient (Kc) values is essential for irrigation scheduling of any crop. In order to determine the values of Kc for jute, an experiment was conducted at the Irrigation and Water Management Division of Bangladesh Agricultural Research Institute (BARI), Gazipur. An improved jute variety BJRI Tosa-2 (O-9897) was used in this experiment. The study examined growth and yield of the jute in terms of four irrigation treatments distributed over 7-28 days intervals. The treatments were so designed that drainage was allowed between the consecutive irrigations. Irrigation at 14days interval produced the highest dry fiber yield (3.93 t/ha) and was considered to be suitable for estimating seasonal crop evapotranspiration and Kc values. The seasonal crop ET was 549.13 mm under this treatment. The Kc values of jute at initial, development, mid-season and late season stages were found to be 0.72, 1.39, 1.26 and 0.46, respectively. As there is no FAO-recommended Kc value for this crop, this locally calibrated values can be used for similar climatic conditions of Bangladesh and elsewhere. Therefore, based on Kc value, it can be recommended that jute can be irrigated by equal amount of water needed for crop evapotranspiration (ETc) for different growth stages (141.05, 142.57, 167.34, and 84.30 mm) to get maximum dry fiber yield. The Agriculturists 2018; 16(2) 115-122

scholarly journals Crop coefficient of a popular potato variety in Bangladesh

2017 ◽  
Vol 42 (1) ◽  
pp. 67-76
Author(s):  
AR Akanda ◽  
MS Rahman ◽  
MS Islam ◽  
AJ Mila
Keyword(s):  
Potato Variety ◽  
Tuber Yield ◽  
Agricultural Research ◽  
Crop Coefficient ◽  
Climatic Conditions ◽  
Growth Stages ◽  
Crop Evapotranspiration ◽  
Agricultural Research Institute ◽  
Initial Development ◽  
Different Growth Stages

Crop evapotranspiration (ETc) and crop coefficient (Kc) values of potato (variety: BARI Alu -7, Diamant) at different growth stages were determined through lysimeter method at Irrigation and Water Management Division of Bangladesh Agricultural Research Institute (BARI), Gazipur during 2008 - 2009. The study was conducted by applying irrigation at 25 and 40 days after planting (DAP) allowing drainage (AD) (T1), at 25, 40, and 55 DAP AD (T2), at 25, 40, and 60 DAP AD (T3), and at 25, 40, 55, and 60 DAP AD (T4) within and adjacent of four lysimeter tanks. Irrigation at 25, 40, and 55 DAP produced the highest tuber yield and was considered to be suitable for estimating seasonal ETc, and Kc values. The seasonal highest ETc was found to be 162 mm. The Kc values of 0.25, 0.62, 0.70 and 0.18 were determined at initial, development, midseason and late season stages of potato. These values differed slightly from the FAO recommended values. As the lysimeter provides control environment, the Kc values determined by this method are most dependable and recommended for estimating ETc of potato in semi-arid climatic conditions of Bangladesh.Bangladesh J. Agril. Res. 42(1): 67-76, March 2017

scholarly journals Determination of Crop Co-efficient Values of Soybean (Glycine max [L.] Merrill) by Lysimeter Study

2017 ◽  
Vol 14 (2) ◽  
pp. 14-23
Author(s):  
A J Mila ◽  
A R Akanda ◽  
K K Sark
Keyword(s):  
Climatic Condition ◽  
Agricultural Research ◽  
Local Level ◽  
Crop Coefficient ◽  
Regional Level ◽  
Crop Evapotranspiration ◽  
Agricultural Research Institute ◽  
Initial Development ◽  
Crop Variety

Local level calibration of crop coefficient (Kc) values is critical for regional level planning and allocation of water resources for irrigation. In this regard, an experiment was conducted at the Irrigation and Water Management Division of Bangladesh Agricultural Research Institute (BARI), Gazipur, in order to estimate crop coefficient values of soybean under the local climatic condition. An improved crop variety- BARI Soybean-6 was used in this experiment. The crop was grown under four irrigation treatments, allowing irrigation at an interval of 10, 15, 20 and 25 days. The treatments were so designed that drainage was allowed between the consecutive irrigations. Irrigation at 15 days interval produced the highest seed yield of 1.26 t/ha and was considered to be suitable for estimating seasonal crop evapotranspiration (ETc) and Kc values. The seasonal highest cumulative ETc was 308.43 mm under this treatment. The Kc values of soybean at initial, development, mid-season and late season stages were found as 0.67, 1.46, 1.59 and 0.62, respectively.The Agriculturists 2016; 14(2) 14-23

scholarly journals Efficient Irrigation for Optimum Fruit Quality and Yield in Apples

HortScience ◽  
2010 ◽  
Vol 45 (11) ◽  
pp. 1616-1625 ◽  
Author(s):  
Esmaeil Fallahi ◽  
Denise Neilsen ◽  
Gerry H. Neilsen ◽  
Bahar Fallahi ◽  
Bahman Shafii
Keyword(s):  
Root Zone ◽  
Fruit Size ◽  
Crop Coefficient ◽  
Sprinkler System ◽  
Irrigation Scheduling ◽  
Tree Canopy ◽  
Crop Evapotranspiration ◽  
Water Deficiency ◽  
System A

Use of crop evapotranspiration (ETc), when a precise crop coefficient value (Kc) is used, provides a reliable tool (irrigation scheduling) for determination of water requirement. In this process, Kc should be modified by percentage of ground shade (GS) and tree canopy maturity (M). In an experiment in Idaho with ET-based irrigation scheduling, each tree with a full microjet sprinkler system received an average of 6461.7 L (994 mm), whereas each one with a full drip system used 3996 L (614.1 mm) of irrigation water. In general, deficit drip irrigation was shown to initially increase yield as a result of induction of stress and the production of a higher number of fruit spurs. However, production declined if the extreme water deficiency was repeatedly applied to the trees over several years. Using a microjet sprinkler system, a partial root zone drying regime reduced fruit size but slightly improved fruit color. Application of water at 65% full drip rate, applied on both sides of the tree row (DD), reduced fruit size. However, when the 65% of full drip rate was applied to only one of the alternating sides of the tree every other week (PRD), fruit size was larger than those with DD treatment.

Irrigation scheduling under water shortage: investigation of scion-rootstock of peach and water deficit combinations

2013 ◽  
Vol 14 (2) ◽  
pp. 312-320 ◽  
Author(s):  
Mohamed Ghrab ◽  
Mohamed Moncef Masmoudi ◽  
Mehdi Ben Mimoun ◽  
Netij Ben Mechlia
Keyword(s):  
Water Use ◽  
Water Status ◽  
Ground Cover ◽  
Water Shortage ◽  
Mean Value ◽  
Irrigation Scheduling ◽  
Climatic Conditions ◽  
Growth Stages ◽  
Early Variety ◽  
Initial Development

Adequate choice of variety, rootstock and irrigation techniques could be, together, sources of improvement of water use. A field experiment was carried out in northern Tunisia on two drip irrigated peach varieties grafted on two rootstocks. Two deficit levels, mild DI1 and severe DI2, were applied. Phenological survey allowed determination of the crop growth stages: initial, development, mid- and late-season. The average lengths of these crop stages were 32, 43, 49 and 136 days for early variety and 33, 49, 63, and 105 days for mid-season variety, respectively. Mean value of crop evapotranspiration (ETc) for the four growth stages was respectively 31, 115, 211 and 420 mm for early variety and 40, 128, 311 and 300 mm for mid-season variety. ETc was restricted with low ground cover to 25, 85, 150 and 280 mm. Tree development, yield and water needs were affected by water status, rootstock and climatic conditions. Threshold values of Ψstem of −1.5 and −2.0 MPa could be considered for mild and severe deficit irrigation. The water use of the soil water seemed to be more efficient with vigorous rootstock under mild deficit. Under extreme watering conditions, rootstock effects were negligible. Lack of chilling affected tree growth inducing reduced water requirements.

scholarly journals Grain Yield and Yield Components of Quality Protein Maize Genotypes as Influenced by Irrigation and Plant Population in the Nigerian Savannah

2014 ◽  
Vol 6 (4) ◽  
pp. 166 ◽  
Author(s):  
B. M. Sani ◽  
I. U. Abubakar ◽  
A. M. Falaki ◽  
H. Mani ◽  
M. M. Jaliya
Keyword(s):  
Grain Yield ◽  
Yield Components ◽  
Agricultural Research ◽  
Field Trials ◽  
Irrigation Scheduling ◽  
Plant Population ◽  
Growth And Yield ◽  
Quality Protein Maize ◽  
Research Station ◽  
Yield And Yield Components

An experiment was conducted to assess the yield and yield components of QPM genotypes to plant population under irrigated conditions in a semi arid ecology of Northern Nigeria. Field trials were conducted at the Irrigation Research Station, Institute for Agricultural Research, Kadawa (11° 39'N, 08° 20'E) and 500 m above sea level) during dry seasons 2007, 2008 and 2009 to study the effect of (Zea mays L.) genotypes (TZE-W Pop X 1368, EV-DT W99 STR and DMR-ESRW), four plant population (33333, 44444, 55555 and 66666 plants ha-1) and three irrigation scheduling (40, 60 and 80 centibars soil moisture tension) on the growth and yield of quality protein maize. A split plot design was used with combinations of genotypes and irrigation regimes assigned to the main plot and plant population assigned to the sub-plot. The treatments were replicated three times. The study revealed that genotype EV-DT W99 STR had significantly higher weight of ears per plant, cob length, cob diameter, number of rows per cob, 100 grain weight, grain yield, shelling percentage and harvest index than the other two genotypes used in the trial. Irrigating at 40 and 60 centibars significantly increased weight of ears per plant, while delayed irrigation significantly depressed total dry matter production. Based on the results obtained in this study, it can be concluded that the use of genotype EV-DT W99 STR, at 60 centibars irrigation scheduling and population of 55,555 plants ha-1 had resulted in good agro-physiological characters of QPM at Kadawa.

Analysis on Coupling Degree among Crop Evapotranspiration, Effective Precipitation and Water Requirement of Corn on Southern Kerqin Sandy Land in China

2013 ◽  
Vol 742 ◽  
pp. 331-336
Author(s):  
Ning Yang ◽  
Zhan Xiang Sun ◽  
Jia Ming Zheng ◽  
Dao Cai Chi
Keyword(s):  
Crop Coefficient ◽  
Growing Season ◽  
Water Requirement ◽  
Weather Data ◽  
Growth Stages ◽  
Sandy Land ◽  
Crop Evapotranspiration ◽  
Irrigation Frequency ◽  
Agricultural Water Management ◽  
Kerqin Sandy Land

Historical characteristics of crop evapotranspiration and irrigation requirement were the bases for determining the irrigation quota in local areas. Based on the trials of two years, crop evapotranspiration and crop coefficient of corn at monthly growth stages were determined and tested by soil water balance method in Fuxin of the southern kerqin sandy land. Using the weather data in Fuxin and Chaoyang from 1953 to 2009, estimated the coupling degree between crop water requirement of λ and apply irrigation water (ETaw) in growing season under three hydrologic years (P=25%,50%and75%).Under the humid year (25%),λ (0.756) in Fuxin was more suitable than Chaoyang (0.694),ETaw(95.5mm) in Fuxin was lower than Chaoyang (148.7mm);under the normal year (50%),λ(0.622) in Fuxin was close to Chaoyang (0.647),ETaw(180.4mm) in Fuxin was higher than Chaoyang (154mm); under droughty year (75%), λ (0.574) in Fuxin was also more suitable than Chaoyang (0.523),ETaw (204.8mm) in Fuxin was also lower than Chaoyang (245mm). The monthly change of λ and ETaw were sharping and influenced irrigation frequency in the growing season of humid and droughty year. The method and results can be further applied to agricultural water management study and guide irrigation in other same regions.

scholarly journals Irrigation and fertigation scheduling under drip irrigation for maize crop in sandy soil

2016 ◽  
Vol 30 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Mahmoud M. Ibrahim ◽  
Ahmed A. El-Baroudy ◽  
Ahmed M. Taha
Keyword(s):  
Sandy Soil ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Water Productivity ◽  
Fertilizer Application ◽  
Irrigation Scheduling ◽  
Growth And Yield ◽  
Control Treatment ◽  
Crop Evapotranspiration ◽  
Irrigation Time

Abstract Field experiments was conducted to determine the best irrigation scheduling and the proper period for injecting fertilizers through drip irrigation water in a sandy soil to optimize maize yield and water productivity. Four irrigation levels (0.6, 0.8, 1.0 and 1.2) of the crop evapotranspiration and two fertigation periods (applying the recommended fertilizer dose in 60 and 80% of the irrigation time) were applied in a split-plot design, in addition to a control treatment which represented conventional irrigation and fertilization of maize in the studied area. The results showed that increasing the irrigation water amount and the fertilizer application period increased vegetative growth and yield. The highest grain yield and the lowest one were obtained under the treatment at 1.2 and of 0.6 crop evapotranspiration, respectively. The treatment at 0.8 crop evapotranspiration with fertilizer application in 80% of the irrigation time gave the highest water productivity (1.631 kg m−3) and saved 27% of the irrigation water compared to the control treatment. Therefore, this treatment is recommended to irrigate maize crops because of the water scarcity conditions of the studied area.

scholarly journals Determination of Wheat Growth, Crop Coefficient (KC) and Water Stress Coefficient (Ks) under Different Salinity

2016 ◽  
Author(s):  
Meysam Abedinpour
Keyword(s):  
Water Stress ◽  
Crop Coefficient ◽  
Crop Growth ◽  
Growth Patterns ◽  
Wheat Crop ◽  
Growth Stages ◽  
Stress Coefficient ◽  
Salinity Levels ◽  
Water Stress Coefficient

A field experiment was conducted for determination of crop coefficient (KC) and water stress coefficient (Ks) for wheat crop under different salinity levels, during 2015-16. Complete randomized block design of five treatments were considered, i.e., 0.51 dS/m (fresh water) as a control treatment and other four saline water treatments (4, 6, 8 and 10 dS/m), for S1, S2, S3 and S4 with three replications. The results revealed that the water consumed by plants during the different crop growth stages follows the order of FW>S1>S2>S3>S4 salinity levels. According to the obtained results, the calculated values of crop coefficients significantly differed from those suggested by FAO No.56 for the crops. The Ks values clearly differ from one stage to another because the salt stress causes both osmotic stress, due to a decrease in the soil water potential, and ionic stress which the average values of water stress coefficient (Ks) follows this order; FW(1.0)=S1(1.0)>S2(1.0)>S3(0.93)>S4(0.82). Overall, it was found the differences are attributed primarily to specific cultivar, the changes in local climatic conditions and seasonal differences in crop growth patterns. Thus, further studies are essential to determine the crop coefficient values under different variables, to make the best management practice (BMP) in agriculture.

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