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Aims: A field experiment was performed in a saline calcareous soil. Its aim was to evaluate the fertilization effects of potassium (K) from different sources in the form of a liquid solution sprayed on both plant and soil on some soil properties and on the carrot (Daucus carota L.) yield and quality. The purpose of the study is to try replacing the traditional soil application of some K fertilizers by spraying application using the liquid solution form.

Two field experiments were carried out during two successive summer seasons of 2016 and 2017 at Gelbana Village east Suez Canal, North Sinai Governorate, Egypt to study the impact of three sources of K-fertilization (K-sulphate, K-humate and Ksilicate) at different application rates i.e. 0, 20, 40 and 60 kg K2O/fed. on seed yield, yield components, chemical composition and seeds quality of peanut plants (Arachis hypogae L.) variety (Giza6). Also, effect of K fertilization on salt affected soil pH, EC and content of some available macro-and micro-nutrients were studied. The experiment was carried out in split plot design with three replicates. Increasing rate of added K resulted in a significant increase of seed yield and its components where the highest values were observed with K-humate application and the lowest values were associated with Ksulphate treatments. Similarly, significant increases of seeds content of N, P and K (%), Fe, Mn and Zn (mg/kg), protein and oil contents (%) were found with increasing rate of added K. There were no significant differences in the found values of the studied trails and parameters between the three sources of K fertilization in the two growing seasons. Both soil pH and EC (dSm -1 ) were decreased with the incremental addition of K, where the obvious diminish occurred in soil fertilized by K-humate followed by those received K-sulphate. In addition, soil contents (mg/kg) of available N, P, K Fe, Mn and Zn were augmented with raising the rate of K fertilization, where the highest contents of these nutrients were found in the soil fertilized by K-silicate followed by those observed with soils fertilized by K-humate. Results obtained from this research indicate the necessity of K fertilization in salt affected soils to improve its properties, increase soil content of available essential nutrients and their agronomic efficiency.

, to study the effect of different methods addition of humic acid on soil fertility and faba bean (Sakha 3) productivity. The experiment includes two methods of application (soil application at rates of 5 and 10 kg humic /fed) and foliar application at rates of (1 g and 2g humic /L water) alone or combined with mineral nitrogen fertilizer at rates of (0, 10, 20 and 30 kg N/fed) as ammonium nitrate (33.5 %N). The obtained results indicated that the effect of addition humic acid methods (soil application or foliar application) significantly increased growth character i.e. plant height (cm), No. of branch /plant, No. of pods/plant, weight of pods /plant (g) and weight of seed/plant (g) in both seasons. As well as, the methods used of humic acid (soil application or foliar application) at different rates had a significant effect on of seed yield (ton/fed), pods yield (ton/fed) and weight of 100 seeds (g) and chlorophyll, respectively, while the protein content was no significant in both seasons. Concerning the effect of humic acid application on N, P and K concentration in seeds were increased with increasing rates of humic 10 kg /fed and mineral N fertilizer 30 kg N/fed. The interaction between humic acid methods system application and different rates of mineral N were significantly increase for Fe in both seasons but no significant for Mn and Zn concentration in seeds faba bean plants. Also, the soil application of humic acid with 10 kg/fed and foliar application at a rate of 2g humic acid /L with 30 kg N led to highest available N, P and K content in soil after faba bean harvest compared with other treatments. On the other hand, the interaction between methods of humic acid application and different rates of mineral N fertilizer on Fe was significant in the first season and Mn in both seasons, while Zn was no significant in both seasons. It can be concluded that soil application of humic acid at rate 10 kg humic /fed and foliar application at rate 2g/L water had a favorable effect on yield and yield component and improve chemical constituents of faba bean and sandy soil.

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