الفهرس 
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Abstract
Two field experiments were carried out to investigate the impact of NPK chemical fertilization levels application and Bradyrhizobium inoculation on cluster bean growth and productivity. These experiments were done at the Experimental Farm (Ghazala Farm), Agric. Fac., Zagazig Univ., Sharkia Governorate, Egypt during summer consecutive seasons of 2019 and 2020. The NPK fertilization were applied at different levels (0.0, 75, 100 and 125% of recommended level) and the Bradyrhizobium inoculation rates were (0.0, 200 and 400 g/ feddan) as well as their combinations on vegetative growth, seed yield, guaran content and some chemical constituents of cluster bean (Cyamopsis tetragonoloba Taub.) plants. The chemical fertilization (NPK) recommended level (RL) were Ammonium sulfate (20.5% N) at 200 kg/feddan, calcium super phosphate (15.5%P2O5) at 200 kg/feddan and potassium sulfate (48% K2O) at 100 kg/feddan. The obtained results pointed out that utilizing 125% RL of NPK gave significantly higher values of cluster bean growth, yield components and guaran as well as total chlorophyll content compared to control and the other levels under study. Bradyrhizobium inoculation at higher rate (400g/ feddan) significantly enhanced all the recorded traits compared to control (without inoculation). However, the best results were recorded by the combination treatment between 105% RL of NPK and 400g Bradyrhizobium / feddan. This combination could be utilized by the cluster bean producers under the same conditions because this it has the greatest profitable rates with the higher seed yield and guaran production advantages.