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A field experiment was conducted at Malawi Agric. Res. Station, Minia Governorate, Egypt during two successive winter seasons of 2014/2015 and 2015/2016 to study the effect of calcium humate (Ca-H), as organic soil conditioner, and nitrogen fertilizer rate under irrigation regime on soil chemical properties and faba bean productivity. The experiment was designed in a split plot design with three replicates, the main plots were occupied by three irrigation regimes: Farmer irrigation (I1), irrigation requirement with 100% WR (I2) and irrigation 75% WR(I3) while sub-plots consists of four treatments (control, 100% N(recommended dose) , Ca-Humate (40 Lfed) and 75% N + Ca-Humate (40 Lfed). Results showed that seasonal water consumptive use increased by increasing available soil moisture as a result of increasing applied water, in general, in both growth seasons. The greatest values of seasonal consumptive use was recorded under farmer practice while the lowest value was recorded under irrigation treatment 75% WR (I3).Also, the interaction effect between irrigation regime and N rates in combination with Ca-H data show that the highest water use efficiency is 1.00 kg seeds/mwater consumption was obtained by irrigation at 75% WR combined with 75% N+Ca-H at second season. The lowest water use efficiency is 0.30 kg seeds/m water consumption was obtained by control treatment under farmer practice. Results revealed that mean values of different irrigation regimes had significantly increased growth characters of faba bean crop (yield, biological yields, 100 seed, plant height, number of branches, number of pods) were observed with I2 (100% WR ) followed by I1 (farmer practices) and I3 (75% WR ), respectively. Applied Ca-H individually or in combination with mineral nitrogen fertilizer were significantlyincreased growth characters of faba bean (yield, biological yield, 100 seed, plant height, number of branches, number of pods) as compared to control treatment. The superior treatmentis75%N+Ca-H at 12 irrigation levels (100% WR). In addition, data reveal that I2 irrigation treatment with 75% N+Ca-H was significantly increased macronutrients total content in (straw and seeds), protein content and protein yield in faba bean crop as compared to control treatment at two successive seasons. On the other hand, chemical soil parameters (pH and EC values) were slightly affected with all applied treatments and increased gradually by decreasing irrigation water. The maximum increased was observed with I2 and applied 75%N+ Ca-H treatment. On the other hand, OM value was decreased with I3 more than I1 and I2, as well as, it was increased by applied calcium hamates application.In conclusion, the application of Ca-H in combination with mineral nitrogen fertilizers was enhanced faba bean crop production and increased NPK content, protein content and protein yield along with improved soil chemical properties under irrigation regimes. Also, Ca-H can be saved about 25% from nitrogen fertilizer dose under low amount of irrigation water.

Effect of Calcium Humate, Nitrogen Fertilizer Rates and Irrigation Regime on Soil Chemical Properties and Faba Bean Productivity