No abstract

R eCeNt fertilization strategies in the world show that the use of environment safe fertilizers is of great importance to decrease the harmful effects of fertilizers on environment and human health, especially in the newly reclaimed soils. therefore, this study was carried out to evaluate the effect of some environmental safe fertilizers (i.e., organic and bio fertilizers) in different sources on sandy soil productivity of peanut plants (Arachis hypogaea L.). the used organic fertilizers were farmyard manure (FYM), solid plant compost (SPC), enriched compost tea with humic substances (eCt) and mixture of FYM and eCt, while the used bio-fertilizers were B1 (Azospirillum braselinse+ Bacillus megatherium + Azotobacter chroococcum) and B2 (Bradyrhizobium sp. USDA 3456+ Serratia marcescens MH6+ Psuedomonas fluorescens IFO 2034. the obtained data showed the superior increase effect of eCt followed by FYM+eCt applications straw, pods and seed yields straw and seeds contents of N, P and K as well as seeds contents of protein and oil. Similar increase for all determined parameters were found in the plants inoculated by B2 compared to that with B1. thus, use of both organic and bio-fertilizers in the fertilization strategy of sandy soil is very important and also may be economically.

A field experiment was conducted during two successive summer seasons of 2018 and 2019 to investigate the effect of biochar application rate and Azolla application time on rice (Oryza sativa L.) plant productivity under salt affected soils. The obtained data show significant increases of straw and grains yield as well as biological yield (Mgfed -1 ) as a result of Azolla and biochar application. The treatment of 10 Mg biochar fed -1 and Azolla at rate of 180 kgfed -1 in two equal doses at 0 and 35 days of transplanting was associated with high yields of straw and grains. Nutrients content (%) and uptake (kgfed -1 ) as well as the relative changes of their uptake by either straw or grains were increased as a result of individual and combined applications of biochar and Azolla. With the same treatment of biochar and Azolla N, P and K content (%) and uptake (kg fed -1 ) in grains were higher than those found in straw. There is a wide variation in straw and grains content of N, P and K, in response to the studied treatments. Also, in both straw and grains under different fertilization treatments, the content of the determined nutrients takes the order K> N> P. These findings concluded that, reducing of salt stress and increasing productivity of salt affected soils may be achieved through biochar and Azolla application.

T HERE are many factors playing major role in use efficiency of phosphatic fertilizers, which varies from soil to another. Therefore, this study aims mainly to evaluate the effect of some trails, i.e. compost additives and P application times in different methods in sandy soil as well as its effect on growth, productivity and quality of peanut (Arachis hypogaea L.). This study was carried out as field experiment in sandy soil at South Al-Tahrir Sector, Al-Behaira Governorate, Egypt during two successive growing summer seasons. The experiment was laid out in a split plot design with three replicates. Four rates of compost i.e. (C1) 0, (C2) 4.76 (C3) 9.52 and (C4) 14.28 ton ha -1 were arranged in the main plots, while the four treatments of phosphorus were randomly distributed in the sub plots.With all the studied treatments of compost and P, the studied growth parameters, i.e. plant height (cm), number of branches per plant, and dry matter weights of straw and leaves were higher in the second growth season than those of first one. Data obtained from our experiments showed that growth parameters increased significantly with the increasing rates of compost application as well as with P applications in three doses (P4). Foliar application of P at 70-80 days of planting (P3) resulted in more increases in the determined growth parameters than those found with other treatments. Similar effect was found with peanut yields of pods and seeds and seeds contents of N, P and K as well as its content of protein and oil.

In a field experiment, plant growth, nodulation status, yield, mineral content, and the rhizosphere enzyme activities of peanut (Arachis hypogaea L), cultivated in sandy loam soil were studied under the effect of the amendment with humic acid and the inoculation with plant growth promoting rhizobacteria (PGPR) that applied as foliar and\or as seed coating. Bradyrhizobium was used as a single inoculum and\or accompanied with PGPR (Azospirillum sp.+ Paeniacillus polymyxa+ Serratia marcescens) with or without humic acid. Results revealed that inoculation with Bradyrhizobium as a single inoculum or accompanied with PGPR, increased significantly shoot dry weight, and yield of peanut under coating and foliar applications. Incorporation of humic acid at two rates of 3L/fed and 5L/fed as foliar and seed coating gave the highest significant values for all tested parameters. inoculation with Bradyrhizobium as single inoculum or accompanied with PGPR enhanced the nodulation status and nitrogenase activity. Also, the values of nodules and nitrogenase activity achieved by coating application method were higher than those recorded by foliar application. In addition, the combined application of coinoculation Bradyrhizobium and PGPR accompanied with humic acid led to significant increases in the content of N, P, and K in shoot plant and in soil. Likewise, humic acid amendment can stimulate the microbial activities in the rhizosphere soil. Higher values of dehydrogenase activity in the rhizosphere soil and carbon dioxide were found with coinoculation and foliar application of humic acid.