RESPONSE OF PEANUT TO DIAZOTROPHIC INOCULATION AND N-FERTILIZATION IN SANDY SOILS IN PRESENCE OF NEMATODES-CONTROLLING AGENTS

SHAHABY, AHMED F.; RAHAL, AHMED G.; SHEHATA, HEBA S.; FAYEZ, MOHAMED

doi:10.21608/ejar.2000.321408

RESPONSE OF PEANUT TO DIAZOTROPHIC INOCULATION AND N-FERTILIZATION IN SANDY SOILS IN PRESENCE OF NEMATODES-CONTROLLING AGENTS

Document Type : Original Article

Authors

¹ Department of Microbiology, College of Agriculture, Cairo University, Giza 12613, Egypt

² Agricultural Microbiology Research Department; Soils, Water and Environment Research Institute; ARC; Giza 72613, Egypt

³ Department of Microbiology, College of Agriculture, Cairo University, Giza 12613, Egypt.

10.21608/ejar.2000.321408

Abstract

A field trail w:3 executed in Ismailia sandy soil. Biomass, nodula-tion, N2-fixation and yield of inoculated peanut cv. Giza 5 were moni-tored in presence of N fertilizer and nematodes-controlling agents (mocap and nemaless). Two rhizobial inocula were used, okadin (Single culture of Bradyrhizobium spp.) and rhizbacterin (dual inoculum of Bra-dyrhzobium spp. and Azotobacter chroococcum). Results demonstrated that higher biomass yield (2.44 - 4.95 ton fed-1) was reportd by okadin inoculation against 2.06-2.58 ton fed-1 due to rhizobacterin. Peanuts treated with mocap (synthetic nematicide) and nemaless (bio-product) were higher in biomass than those untreated. Okadin supported higher nodule biomass compared to rhizbacterin whether N fertilization was ap-plied or not, such effect was more pronounced with nematodes-controlling agents-treatd plants. Nematodes-controlling agent supported better nodulation of uninoculated plants where nodule numbers in-creased by 21.3 and 5.6% due to treatment with mocap and nemaless, respectively. Nemaless-treated peanuts beared nodules with a dry weight of 1.42 g plant-1 compared to 1.13 g plant-1 for those supplied with mocap. Rhizobacterin, in absence of N fertilizer, produced the high-est pod yield (1.94 ton fed-1) while the lowest (1.65 ton fed-1) was re-corded by either untreated plants or those fertilized with 45 kg N fed-1. Nemaless-treated peanuts did produce superior pod yield approxmating 23% higher than that due to mocap treatment. Inoculated plants, with rhizobacterin in particular, received no N-fertilizer exhibited higher acet-ylene reducing activity on their roots compared to those simultaneously fertilized with 45 kg li fed-1. Protein and peel yields considerably varied depending upon treatment.

Keywords