Nitrogen‐enriched compost application combined with plant growth‐promoting rhizobacteria (PGPR) improves seed quality and nutrient use efficiency of sunflower

Abstract

Ecological benefits associated with plant growth-promoting rhizobacteria (PGPR) inoculants offer a promising integrated nutrient management option to counteract plant nitrogen (N) deficiency. We performed field experiments to evaluate the effect of integrated N fertilizer regime involving chemical N fertilizer (CNF) and N-enriched compost (NEC), either alone or combined with selected PGPR (Pseudomonas aeruginosa) on sunflower seed quality, N use efficiency (NUE) and soil fertility during 2014-2015. We found that integrated N biofertilizer application resulted in significantly higher seed oil concentration, fatty acid composition, and harvest index in both cropping years. Greater effects on N yield efficiency (NYE), N use efficiency (NUE), N physiological efficiency (NPE), and photosynthetic N use efficiency (PNUE) were recorded in nitrogen-enriched compost+PGPR inoculant (NECPI) treatment followed by chemical N fertili-zer+PGPR inoculant (CNFPI) treatment. Statistically significant differences were observed in linoleic and linolenic acid, NYE, and NUE for treatment year interaction, thus, suggesting that the integrated N biofertilizer approach facilitates the efficient N use by sunflower for improving yield and seed quality. Moreover, we also found considerable enhancement of soil N fertility after two consecutive cropping years of sunflower. The enhancement of seed quality, N use efficiencies, and soil N fertility through integrated N biofertilizer application emphasizes the importance of balanced crop N nutrition, ensuring sufficient N supply to sunflower with adequate N balance in soil for the next crop. Overall, combination of PGPR with NEC amendment may optimize N uptake efficiency and reduce N fertilizer losses, which is necessarily required for the sustainable sunflower production.

Production and Implication of Bio-Activated Organic Fertilizer Enriched with Zinc-Solubilizing Bacteria to Boost up Maize (Zea mays L.) Production and Biofortification under Two Cropping Seasons

“…The organic matter might have served as a source of nutrients for bacterial growth [58]. The positive role of organic materials to improve the survival, population and bio-fertilization performance of PGPB in the soil has also been described in numerous previous studies [59][60][61][62].…”

Enhancing total lipid and stearidonic acid yields inBuglossoides arvensisthrough PGPR inoculation

“…As many factors can influence plant growth under field conditions, additional independent field trials would need to be performed to properly assess the ability of LBUM677 to influence B. arvensis growth and oil/SDA accumulation under various field conditions. Previous studies have shown increases in the growth and productivity of oil seed crops, such as sunflower (Shehata and El-Khawas 2003;Reddy et al 2005;Arif et al 2017), peanut (Parasuraman and Mani 2003;Dey et al 2004), canola (Lifshitz et al 1987;Asghar et al 2002Asghar et al , 2004, soybean (Kumar and Dube 1992;Dashti et al 1997;Egamberdiyeva et al 2004;Afzal et al 2010) and mustard crops (Penrose and Glick 2003;Joshi et al 2006) due to inoculation with beneficial bacteria. Silva et al (2014) demonstrated that inoculating Rhizobium strains were able to increase fatty acid content in Capsicum annuum L and Nosheen et al (2011) found that inoculation of Brassica napus L. with Azotobacter vinelandii was able to significantly increase oil content in the plant by 4%.…”

Membrane shell permeability of Rs-198 microcapsules and their ability for growth promoting bioactivity compound releasing

“…MB treatment showed highest total nitrogen and phosphorus contents in cotton plants, which increased by 43.48% N and 46.51% P compared with CK; followed by FB treatment, which increased by 29.14% N, and 28.45% P. Various microbial inoculants are already reported to promote soil microbial development, nutrient availability and plant growth through processes such as nitrogen xation, nutrient mobilization, plant growth regulator syntheses in recent years. 40,41 These nding may be due to the increased N 2 xation and phosphorus solubilization ability of Rs-198. What's more, more Rs-198 survived in the microcapsules and will cause more available N and P in rhizosphere soil, so MB showed highest total N, P contents.…”