Response of wheat grown on alluvial and calcareous soils to potassium fertilization under saline irrigation water
Abstract: Greenhouse experiment was conducted to study the effect of saline irrigation water and potassium fertilizer on soil salinity and wheat (Triticum aestivum L.) cultivar were grown on two soils. The irrigation water salinity, ECw were 0.61, 4.69, 9.38 and 14.06
d Sm-1. The K-fertilizer rates were 0, 1.0, 2.0, 3.0 and 4.0 g pot-1 as K2S04. Wheat cultivar, Giza 168 was grown to maturity on alluvial and calcareous soils. Soil properties, wheat yield and yield components were determined and statistically analyzed.
The results revealed that the increase in ECe of alluvial soil to 5.74,11.48 and 16.95 dSm-1 was almost proportional to the ECw of 4.69, 9.38 and 14.06 dSm-1, respectively compared with an initial ECe of 1.97 dSm-1. With calcareous soil, the corresponding ECe values were 5.98, 11.96 and 18.58 dSm-1 for the ECw of 4.69, 9.38 and 14.06 dSm-1, respectively compared with an initial ECe of 2.05 dSm-1. A quantitative approach with linear regression revealed that the slopes were 1.13 and 1.17 for alluvial and calcareous soil, respectively.
The results indicated that wheat grain and biological yield significantly decreased as salinity was increased. The decreasing percent of grain yield over the control treatment were 18.29, 45.55 and 57.07% for ECw 4.69, 9.38 and 14.06 dSm-1, respectively. The corresponding values of the biological yield were 16.74, 36.09 and 46.37%, respectively. However, the 100–grains weight was not affected by salinity ECw to 4.69 dSm-1 (4.45g) then followed by a reduction to 3.83 g as ECw increased to 14.06 d Sm-1. The same trend was also obtained for the yield components: spikes numbers and spikes weight per pot were being reduced by 41.75 and 48.46 %, respectively at the ECw of 14.06 dSm-1. Such dropping was significantly varied within K fertilizer rates. Average all over salinity and soil types, the K fertilizer rates 3.0 and 4.0 g/pot gave maximum response for Giza 168 grain yield. The same trend was also obtained for the biological yield and the yield components. However, the differences between 3.0 and 4.0 g/pot were not significant for all studied characters.
With respect to soil types, wheat produced more grain in clay than in calcareous soil, being 33.93% greater while biological yield was 30.68%. The 100–grains weight was significantly not affected by soil types. The results indicated that the potassium– use efficiency(KUE) reached the highest value (6.43) at the fertilizer rate of 3.0 g/pot. Average all over soil types and at control salinity treatment, increasing the K level from 1.0 to 2.0
g /pot brought an increasing in KUE from 4.25 to 6.40 whereas decreased to 4.46 by the further increasing of K level to 4.0 g /pot. At salinity 4.69 dSm-1, the KUE was obviously appreciably greater than at high salinity. The KUE values at 3.0 g /pot level reached 5.20, 4.86 and 3.99 for 4.69, 9.38, and 14.06 dSm 1, respectively. This general pattern of yield –K response was found to modify according to salinity and maximum permissible of ECw should not exceed than 4.69 dSm-1 to offset soil degradation and to obtain the economical productivity of wheat
Publication year 2006
Pages 207-213
Availability location Soils, Water and Environment Research Institute, ARC
Availability number
Organization Name
Country Egypt
City Alexandria
Publisher Name: Prof.Dr. A.M. Balba, Soc. For Soil & Water Research
serial title Alexandria Science Exchange
ISSN 1110-0176
Volume 27 . 2
Department Soil Salinity and Alkalinity Res. Lab.
Author(s) from ARC
Agris Categories Soil erosion, conservation and reclamation
AGROVOC
TERMS		 Calcareous soils. Clay soils. Potash fertilizers. Saline water. Wheats.
Publication Type Journal
↑