Abdel- Aziz, E., EI- Bialy, U. (2004). RESPONSE OF MAIZE PLANT TO SOIL MOISTURE STRESS AND FOLIAR SPRAY WITH POTASSIUM. Journal of Soil Sciences and Agricultural Engineering, 29(6), 3599-3619. doi: 10.21608/jssae.2004.241932
EI- Set A. Abdel- Aziz; U. S. EI- Bialy. "RESPONSE OF MAIZE PLANT TO SOIL MOISTURE STRESS AND FOLIAR SPRAY WITH POTASSIUM". Journal of Soil Sciences and Agricultural Engineering, 29, 6, 2004, 3599-3619. doi: 10.21608/jssae.2004.241932
Abdel- Aziz, E., EI- Bialy, U. (2004). 'RESPONSE OF MAIZE PLANT TO SOIL MOISTURE STRESS AND FOLIAR SPRAY WITH POTASSIUM', Journal of Soil Sciences and Agricultural Engineering, 29(6), pp. 3599-3619. doi: 10.21608/jssae.2004.241932
Abdel- Aziz, E., EI- Bialy, U. RESPONSE OF MAIZE PLANT TO SOIL MOISTURE STRESS AND FOLIAR SPRAY WITH POTASSIUM. Journal of Soil Sciences and Agricultural Engineering, 2004; 29(6): 3599-3619. doi: 10.21608/jssae.2004.241932
RESPONSE OF MAIZE PLANT TO SOIL MOISTURE STRESS AND FOLIAR SPRAY WITH POTASSIUM
1Crops physiology Res. Sec., Field Crops Res. Inst., ARC.Giza, Egypt.
2Physics and Chemistry of Soil Res. Dep., Soil, Water and Env. Res. Inst., ARC. Giza, Egypt.
Abstract
Foliar application of potassium and soil moisture stress were evaluated through two successive field experiments during growing seasons of 2001 and 2002 at Giza Agricultural Research Station. A. R. C. To verify this objective. maize ( Zea mays) • single cross ( S.C.10) cultivar was grown and treated with potassium fertilizer at concentrations of 0 . 2 and 3 % KzO as foliar application under three conditions of soil moisture content expressed as depletion in available soil moisture namely wet (35- 40 %). medium (55 - 60 %) and dry (75 - 80 %), depletion in AS. M. Results of the combined analysis could be summarized as follows:
1· Plant height and stem diameter of the plant were Significantly increased under wet treatment followed by those under medium and dry ones. The same parameters showed gradual and significant increase with raising the concentration of K20 from o to 3 % . However; the interaction between the two factors was insignificant as wetl.
2- AU growth parameters i.e, leaf area index (lAl). net assimilation rate (NAR) and crop growth rate (CGR) at all growth stages were Significantly higher under wet treatment than those under the other soil moisture stress levets.
3- LAI at all growth stages and NAR at the last period of growth (80-90 days after sowing, DAS) were significantly increased with the gradual increase of K20 up to 3%. while vice versa was observed at 35·50 DAS. At the period of 65·80 DAS, NAR was the highest and significant with 2% K20. CGR at all growth stages was significantly increased with increasmq K20 level.
4· The significant effect of the interaction between moisture stress and K spray was pronounced for NAR. CGR and LAI at 50-65 and 80·90 and 35-50 DAS periods, respectively.
5- All yield attributes of maize plant were significantly and gradually increased as a result of raising the availability of soil moisture content and the level of K20 up to 3%. The exception is shelling% Which didn't affect with spraying K20. However, no significant effect could be noteced due to the interaction between the two factors under study on all yield parameters.
s-There was gradual and significant increase of maize productivity as a result of the reduction in soil moisture depletion. The same response was observed for raising K-Ievel. However. the interaction caused inSignificant effect on grain and stover yields ..
7- Higher protein content of maize grains was gained under condition or severe in soil moisture content. Spraying maize plants with water (0% K20) caused the highest protein content and the interaction between the above two treatments was the best. Total carbohydrates content of the grains showed a reverse trend for main and the interaction effects.
9· The highest mean values of water consumptive use during growing season were recorded when maize plants sprayed with the highest level of K20 (3%) under wet treatment. Whereas, water use efficiency (kg/m3) reached its highest value at medium soil moisture stress with potassium nutrition.
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