To study the effect of biofertilizers on physiological parameters and yield  of three varieties of Oat (Avena sativa L.), field experiments were conducted during winter seasons 2016-2017 and 2017-2018 at Al- Zubair district (20 km. West of Basrah province) in sandy loam soils. A split plot arrangement, using RCBD with three replicates, the main plots contained varieties: V1 (Genzania), V2 (Shaffaa),  V3  (Carloup), Biofertilizer, treatments were at the sub plots: B0 (control), B1 (NPK mineral fertilizer as recommended), B2 (biofertilizers NPK), B3 (mineral fertilizer PK+ biofertilizers N), B4 (mineral fertilizer K+ biofertilizers NP), B5 (mineral fertilizer P + biofertilizers NK), B6 (mineral fertilizer N + biofertilizers PK). Data were collected on Flag leaf area FLA, Leaf area duration LAD, Leaf area index LAI, Crop growth rate CGR, Relative growth rate RGR, Net assimilation rate NAR, Plant high Tillers number m2 and grain yield t ha-1. The results showed that the adding of biofertilizers NPK (B2) led to a significant increase in the studied traits (FLA, LAD, LAI, CGR, RGR, NAR, and grain yield). The grain yield were increased about 189.96 and 197.3% as compared with control in each seasons respectively. Cultivar Genzania resulted in highest grain yield among studied varieties in the first season (5.774 t ha-1), while cultivar Shaffa  gave the highest grain yield in the second season (8.691 t ha-1). The interaction between Ganzania and B2 treatment recorded the highest seed yield (8.429 tan ha-1) in the first season. While, in the second season all varieties that interacted with B2 treatment produced the highest seed yield.

A field experiment was conducted during winter season of 2018-2019, at Al-Qurna district (75 km north of Basrah city centre). The aim of experiment was studding the effect of five levels of micronutrients (MN), Fe, Zn, Mn, Cu, B, and Mo: 0, 2 and 4 kg. ha-1 (soil application), 500 and 1000 ppm (foliar application), and three levels of activated yeast extract (AYE): 0, 3 and 6 g. L-1, in the yield and qualitative characteristics of wheat. The experiment was carried out using randomized completely block design in a split arrangement with three replicates. The main plots contained fertilizer levels. While the sub-plot occupied by Yeast levels. The results showed that spraying 1000 ppm from the solution of MN significantly increase the number of spikes per m2 , the number of grains in the spike, grain yield and biological yield with an increase by 15.4%, 18%, 27.5 % and 35% respectively compared to the control treatment, while the concentration of 500 ppm significantly increase protein yield with an increase of 35% compared to the control treatment. The results also showed that spraying 6 g. L- 1 of AYE differ significantly and gave the highest values of spikes number per m2 , number of grains per spike , grain yield , biological yield and protein yield, with an increase by 5.84%, 7.1%, 11.4% , 11.1% and 10.9% respectively compared to the control treatment. The interaction between application of 4 kg. MN ha-1 and the level of 6 g. L-1 AYE gave a significant superiority in the number of spikes (333.9 spike m-2), while the spraying of 1000 ppm + 6 g. L-1 AYE gave the highest grain yield (8.891 ton. ha-1) and biological yield (31.827 ton. ha-1).

A field experiment was conducted during the autumn season of 2018 at agricultural research station in Al- Qurna district (80 km north of Basra center). The aim was to study the effect of spraying different concentrations of humic acid (HA) and silicon on the some growth characteristics of maize (Zea mays L.). The experiment was conducted using Three Concentration of humic acid were used 0, 2 and 4 gm L-1, which took the following symbols H0, H1, and H2 respectively and four concentrations of silicon 0, 1, 2 and 3 mML-1 which took the symbols S0, S1, S2 and S3 respectively. A factorial experiment was used in randomized completely block design with four replicates. Maize seeds cv. Fajir1 were planted at 20/7/2018 in a silty loam soil. The results showed that the concentrations of HA differed significantly in all most of the studied characteristics, plant height, leaf area and ear length with an increase by 11.69, 24.89 and 3.49% respectively as compared to the control treatment (H0). The spraying with silicon showed a significant effect. Moreover, the concentration of S3 gave the highest values for plant height, stem diameter, leaf area and ear length. The interaction between HA and silicon showed a significant effect on some of the studied characteristics, the combination of S3×H2 produced the highest values of plant high (174.42 cm) and leaf area (7390.65 cm2).

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