الفهرس 
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Abstract
This study was conducted at the Agric. Res. Station, Fac. of Agric. Zagazig Univ., Sharkia Governorate, Egypt, throughout the winter seasons of 2019/ 2020 and 2020/ 2021. The study investigated the impact of ten bio-chemical phosphorus fertilization and lithovit regimes on the forage growth, yield, yield attributes and forage quality traits of six Egyptian clover varieties (Berseem, Trifolium alexandrinum L.) q.e. Helaly, Gemmiza 1, Sakha 4, Serw 1, Giza 6 and local variety. The ten fertilization regimes investigated were F1, control; F2, chemical phosphorus 15.5 P2O5 Kg/ fad; F3, bio-phosphorus fertilizer ‘phosphorein‘; F4, 50 % of F2 + phosphorein; F5, 25 % of F2 + phosphorien; F6, F2 + lithovit; F7, F3 + lithovit; F8, F4 + lithovit; F9, F5 + lithovit; F10, sole lithovit. A spilt plot design with three replicates was used in both sowing seasons. The main plots were occupied by the six berseem varieties, the sub-plots were allotted to the ten bio-chemical phosphorus fertilization and lithovit regimes. The obtained results indicated that the first rank regarding the total fresh forage yield was Helaly berseem variety recording 31975.93 Kg/ fad in the combined analysis. The total fresh forage yield produced by Gemmiza 1 berseem variety was the lowermost one. It is evident that application of the F4 fertilization regime was effectual and exigent fertilization regime indispensable to the achievement of copious total fresh forage yield amounted to 30332.64 Kg/ fad for the combined analysis. Sensibly decrements in the total fresh forage berseem yield were the resultant of application whichever F6 and F9.The outmost total fresh forage yield was the outturn of F4 × Sakha 4 interaction, whilst the lowermost one was the result of the interaction between F1 and Gemmiza 1. Giza 6 ranked first in forage quality because of its high content of each CP (%), NFE (%), TDN (%), and DP (%) in the 3rd cut. The local variety ranked the least over the six Egyptian clover varieties with the highest ash (%) in the 1st cut. Other varieties were in between. Allusion to the bio-chemical phosphorus fertilization and lithovit regimes, application of any phosphorus fertilization regimes surpassed the control treatment in most nutritive values. Application of F9 tended to produce high forage quality with high content of CP (%) in the 1st cut, TDN (%) in both 1st and 3rd cuts as well as DP (%) in the 1st cut. Results disclosed varietal differences in each of phosphorus content (P%), digestible energy (DE Kcal/ g dry matter), protein yield (Kg/ fad), as well as carbohydrate and fiber yields (Kg/ fad.) in both the 1st and the 3rd cuts. The ten bio-chemical phosphorus fertilization and lithovit regimes resulted in a significant impact on the above cited traits in both the 1st and the 3rd cuts.