Aims: Two field experiments have been carried out to study the effect of different irrigation periods in the presence of compost as an organic amendment on the yield and quality of lupine (Lupinus termis L.) under the sandy soil conditions. Study Design: Split-plot design.  Place and Duration of Study: The successive winter seasons of 2016/2017 and 2017/2018 at the Ismailia Agricultural Research Station, (30°35'30" N 32°14'50" E elevation 3 m), Agricultural Research Center (ARC), Egypt. Methodology: Compost has been applied at the rates of 11.90, 23.81 and 35.71 ton/ha before planting. Three irrigation intervals were assigned after planting by 3, 6, and 9 days; the applied water volume for each was 4761.91 m3/ha. Results: After harvesting, some parameters were estimated. As the compost rates increased, the soil EC significantly decreased while the available N, P, K, and Fe were significantly increased by 9.51, 12.79, 5.17, and 5.8%, respectively. For same compost rate, the irrigation intervals (3, 6, and 9 days) significantly decreased the available N relatively by 2.88, 5.16, and 6.96%, respectively and the available K by 3.45, 5.06, and 4.37%, respectively. The 6 days interval showed that most significant increase in the seeds' content of nutrients at different compost rates and the seed yield has increased by 19.59, 22.31, and 21.88% for the compost rates of 11.90, 23.81, and 35.71 ton/ha, respectively. The relative increase was by 20.48, 7.63, 4.49, 10.89, and 14.92% for the crude protein, crude lipids, total ash, TSS and the amino acids, respectively. The effect of treatments on the relative shoot moisture (%) and the field water use efficiency (F.W.U.E.) (kg/m3) was discussed. Conclusion: The 6 days irrigation interval along with a compost application rate of 23.81 ton/ha can be recommended for lupine grown in sandy soil as they showed the most significant increase in the nutrients content of seeds by 22.31%.

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 conducted in clay salt affected soil in Sahl El-Hussinia, El-Sharkia Governorate, Egypt, during two winter seasons2016/2017and2017/2018 to evaluate the effect of mineral fertilizers with different rates(10-20-40 kg/fed. N); (15-25-30 kg/fed. P 2 O 5 ,) and (20 -30 -40 kg/fed. K 2 O,) alone or with bio-fertilizers or potassium humate on some soil properties (available N, P, K, Fe, Mn, Zn and E.C), yield and quality of pea plants. The results revealed that the studied the soil salinity EC (dSm -1 ) decreased in soil treated with potassium humate and bio-fertilizers with mineral fertilizers compared with control. The available soil macronutrients i.e. N, P, K, and micronutrients i.e. Fe, Mn and Zn (mg/kg soil) after harvesting in soils treated with biofertilizers and potassium humate with or without mineral fertilizers were increased with increasing mineral fertilizers (NPK) rates. Concerning, the relative increases of all estimated parameters pea plants in both seasons shows gradually increases as follows: potassium humate > bio-fertilizers > mineral fertilizers > control for plant height (cm) , number of branches/ plant, pods/ plants and weight 100 seeds. While, the bio-fertilizers > potassium humate > mineral fertilizers > control for No. of seeds /pods in both seasons. Also, using potassium humate, biofertilizers and mineral fertilizers led to significant increases for dry weight/ plant, fresh pod /plant (g) and yield of pods ton/fed. As well as, potassium humate and biofertilizers in combination with NPK chemical fertilizers increased P and K concentration in seeds. Mineral fertilizers (NPK) combined with or without potassium humate and bio-fertilizers increased on Fe, Mn and Zn concentrations in pea seeds in both seasons .The micronutrients were increased with increasing rate of chemical fertilizers as compared without bio-fertilizers or potassium humate. The interaction between all treatments and mineral fertilizers rates led to significant increase in carbohydrate and proline contents of seeds, while the total sugar content in pea plants was unsignificant. Further, combined application of potassium humate and inorganic fertilizers improved the soil properties. This characterizes the synergistic effect of potassium humate and biofertilizers combined with mineral fertilizers thereby signifying that integrated use of inorganic, organic and biofertilizers helps in upgrading soil health.

Two field experiments were carried out at private farm at El-quntra Shark, Ismailia Governorate, Egypt, during two successive seasons of summer 2018 and 2019 to study the effect of soil amendments (biochar, compost and biofertilizer) with or without different rates of nitrogen mineral fertilizer on the fertility of study soil and maize productivity. In both seasons, each experiment was carried out in split plot design with three replicates. The obtained results indicated that the soil pH and EC (dSm-1) tended to decrease with increasing nitrogen mineral combined with compost and bio-fertilizer than biochar. The high of mean values of available N, P and K in soil was 44.04, 5.93 and 177.00 mg/kg soil for soil treated by compost together with nitrogen mineral fertilizer. Application of soil amendments had positive significant effect for Fe and Zn, while was not significant for Mn content in soil. The effect of biochar, compost and bio-fertilizer combined with different rates of nitrogen mineral fertilizer on plant height (cm), weight of 100 grains (g), weight of stover (ton/fed), weight of ears (ton/fed) and weight of grains yield (ton/fed) were increased with increasing nitrogen mineral application rate except plants treated with bio-fertilizer. The effect of soil amendments application significantly increased N, P and K concentrations in stover and grains. The interaction between soil amendments and different rates of nitrogen mineral fertilizer showed insignificant affect on the amount of Fe, Mn and Zn in stover and grains of maize. The application of soil amendments improved the growth characters and grain yield of maize and also the chemical and physical properties of soil.