Tag Archives: Irrigation scheduling

Irrigation Scheduling of Maize Crop Under Different Levels of Sprinkler Irrigation and the Correlation with Some Productivity Traits

Ali Kinjo(1) Jamil Abbas(1) Rabee Zaina(2) andNeveen Hassoun*(1)

(1). Soil and Water Department, Faculty of Agriculture, Tishreen University, Lattakia, Syria.                                                                                                                  

(2). Latakia Research Center, General Authority for Scientific Agricultural Research GCSAR, Damascus, Syria.

(*Corresponding author: Eng. Neveen Hassoun. E.Mail: nevenhassoon80@gmail.com).

Received: 14/05/2019                                Accepted: 04/07/2019

Abstract

The research was conducted at Sit Kheris Agricultural Station in Latakia Agriculture Center, General Commission for Scientific Agricultural Research (GCSAR) in Syria, during the season 2018. The maize variety (Gasper) was used. Three levels of irrigation were applied (70, 80 and 90%) of the total water requirements of plant in addition to the control (100%). The experiment was executed according to Randomized Complete Block Design (RCED) with three replicates. Evapotranspiration values (ETo) were calculated by (Eto calculator ) program and the evaporation values of Class A Basin which were periodically taken in order to study the efficiency of water use efficiency, water  consumption and scheduling crop irrigation, in addition to the study of correlation and regression of productivity, and the most important components of maize variety under the conditions of the Syrian coast. The results showed a positive and strong correlation between ETo values ​​calculated using ETo calculator program and evaporation ETo values that were calculated by Class A basin (r = 0.975). The largest quantity of the total consumption of water was at flowering stage where it ranged between 619.92 m3/ha at the level of (70%) to 885.69 m3/ha at (100%), while the lowest was at the seedling stage where it ranged between 103.32 m3/ha at the level of (70%) to 147.69 m3/ha at (100%). The results also showed that there was a positive correlation between the productivity of the individual plant with the weight of 100 grains (r = 0.963 **) and moderate positive correlation with single leaf area (r=0.605), leaf area (r=0.603*), harvesting index (r = 0.537), and ear length (r = 0.489). The regression showed that applied irrigation program can increase the weight of 100 grains which will lead to an increase in the individual productivity of plant by 92%.

Key words: Irrigation scheduling, Evapotranspiration, Maize, Correlation coefficient, Regression coefficient.

Full Paper in Arabic: PDF

The Suitability of CropWat 8 Program in Scheduling Irrigation and Water Consumption Estimation for Some Crops and Fruit Trees in Damascus Countryside

Ayman Hejazi*(1) Rabiaa Alhayek(2) and Mohammad Hakkoun(1)

(1). Natural Recourses Research Administration, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.
(2). Agricultural Research Center of Salamya, (GCSAR), Hama, Syria.

(*Corresponding author:  Eng: Ayman Hejazi. E-Mail: siraiman@yahoo.com).

Received: 30/06/ 2015                                     Accepted: 07/09/ 2015

Abstract

This theoretical study was carried out in 2014 to study CropWat 8 model suitability to estimate water requirements and irrigation scheduling for some fruit trees and crops, using field trials data, which had been executed at Nashabia Irrigation Research Station, Damascus Countryside, Syria. The data that have been gotten of the net water consumption and number of irrigations for apricot, olive trees, tomato, and maize of field trials were compared with those results that have been gotten using the program . The results showed an increase in the estimated value as compared with real one for water consumption with a percentage of (1%) for apricot, and (23%) for tomatoes. The means differences between the estimated and real values, using T-test (paired samples) by SPSS showed insignificant differences for apricot, olive, and maize, except tomato where the differences were significant at 5% level of probability, also it was noticed in terms of the number of irrigations that there was a high matching between the estimated and real values for apricot, olive, and corn, but for tomatoes there was a difference in about 4 irrigations, this difference is due to the difference in crop coefficient values between the estimated program value and the calculated (real value). The simulation model curve of changes in soil moisture was similar to the changes in moisture in the field conditions to a large extent. Root mean square error (RMSE) values for water consumption of apricot, olive, tomato, and corn were as follows: 6.4, 14.5, 45.41, and 26.53 respectively, while the values of Index of Agreement (d) were as follows: 0.98, 0.83, 0.81, 0.94 respectively, which indicates a good matching between estimated and real values.

Key words: CropWat8, Water consumption, Irrigation scheduling.

Full paper in Arabic:

مدى ملائمة برنامج CropWat8  لجدولة الري وتحديد الاستهلاك المائي لبعض المحاصيل والأشجار المثمرة المزروعة في غوطة دمشق