.IRRIGATION SCHEDULING AND WATER REQUIREMENTS FOR POTATO CROP AT MIDDLE DELTA SOIL
Safinaz Abd El-Aziz Abd El-Mobdy;
Abstract
The objective of the present study, is to use the agroclimatological data, in estimating the water consumptive use for potato crop, under the conditions of El-Gharbya area, and to schedule for potato irrigation, using the evaporation pan records, through determining the effective evaporation coefficient, which give the highest yield, and the best water use efficiency. Also, the work aimed to quantify the effects of irrigation scheduling on potato yield and quality.
Two field experiments were carried out at the experimental farm of the faculty of agriculture, at Tanta University ofTanta, during the winter plantation (season 99/2000) and the Nili (fall) plantation (season
2000/2001). Potato tubers ofDiamond variety were sown on 5 Dec. 99, as
winter cropping, and on 17 Oct. 2000, as Nili cropping. Harvesting was generally carried out after 115 days from planting on 29 March 2000 and on
07 Feb., 200 l for winter and Nili plantation, respectively. The experiments
were laid down in a complete randomized blocks design with four replicates. The experiment included seven treatments which were six effective evaporation coefficients according to the daily evaporation r;an treatments ( Et), 1.4, 1.2, 1.0, 0.8, 0.7 and 0.6 besides to conventional irrigation treatment, which represent the farmer practices in the studied area.
The soil moisture depletion (SMD) was determined periodically, by the gravimetric method, and the actual seasonal evapotranspiration of potato (actual ETc) was calculated. The reference evapotranspiration (ETo) was estimated ti•om four equations, according to modified Penman-Penman Montieth, Doorenbos and Pruitt and pan evaporation equations, and was used to estimate the consumptive use throughout potato growth seawn (estimated ETc). Crop coefficient (Kc) was calculated for the different growth stages, using actual ETc and the ETo. Some vegetative growth parameters were recorded at 70 days from planting. At harvest, yield, yield components and some yield quality parameters were determined.
The obtained results could be summarized as follows:
1. Irrigation scheduling (water amount and time of irrigation):
The scheduling of irrigation, in the present study which depends on using the daily evaporation records, needed to the determination of the readily available soil water (RAW), and the cumulative pan evaporation (CPE) which represent the usable evaporation through the effective evaporation coefficient (Et), by using the relation; RAW- (Et) (CPE).
Two field experiments were carried out at the experimental farm of the faculty of agriculture, at Tanta University ofTanta, during the winter plantation (season 99/2000) and the Nili (fall) plantation (season
2000/2001). Potato tubers ofDiamond variety were sown on 5 Dec. 99, as
winter cropping, and on 17 Oct. 2000, as Nili cropping. Harvesting was generally carried out after 115 days from planting on 29 March 2000 and on
07 Feb., 200 l for winter and Nili plantation, respectively. The experiments
were laid down in a complete randomized blocks design with four replicates. The experiment included seven treatments which were six effective evaporation coefficients according to the daily evaporation r;an treatments ( Et), 1.4, 1.2, 1.0, 0.8, 0.7 and 0.6 besides to conventional irrigation treatment, which represent the farmer practices in the studied area.
The soil moisture depletion (SMD) was determined periodically, by the gravimetric method, and the actual seasonal evapotranspiration of potato (actual ETc) was calculated. The reference evapotranspiration (ETo) was estimated ti•om four equations, according to modified Penman-Penman Montieth, Doorenbos and Pruitt and pan evaporation equations, and was used to estimate the consumptive use throughout potato growth seawn (estimated ETc). Crop coefficient (Kc) was calculated for the different growth stages, using actual ETc and the ETo. Some vegetative growth parameters were recorded at 70 days from planting. At harvest, yield, yield components and some yield quality parameters were determined.
The obtained results could be summarized as follows:
1. Irrigation scheduling (water amount and time of irrigation):
The scheduling of irrigation, in the present study which depends on using the daily evaporation records, needed to the determination of the readily available soil water (RAW), and the cumulative pan evaporation (CPE) which represent the usable evaporation through the effective evaporation coefficient (Et), by using the relation; RAW- (Et) (CPE).
Other data
| Title | .IRRIGATION SCHEDULING AND WATER REQUIREMENTS FOR POTATO CROP AT MIDDLE DELTA SOIL | Other Titles | جدولة الرى والاحتياجات المائية لمحصول البطاطس فى أراضى وسط الدلتا. | Authors | Safinaz Abd El-Aziz Abd El-Mobdy | Issue Date | 2001 |
Recommend this item
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.