Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

A Greener Approach to Spinach Farming: Drip Nutrigation with Biogas Slurry Digestate

Version 1 : Received: 25 June 2023 / Approved: 26 June 2023 / Online: 26 June 2023 (07:06:06 CEST)

A peer-reviewed article of this Preprint also exists.

Yadav, R.; Sudhishri, S.; Khanna, M.; Lal, K.; Dass, A.; Kushwaha, H.L.; Bandyopadhyay, K.; Suman, A.; Singh, A.; Singh, R.K.; Singh, R. A Greener Approach to Spinach Farming: Drip Nutrigation with Biogas Slurry Digestate. Agronomy 2024, 14, 681. Yadav, R.; Sudhishri, S.; Khanna, M.; Lal, K.; Dass, A.; Kushwaha, H.L.; Bandyopadhyay, K.; Suman, A.; Singh, A.; Singh, R.K.; Singh, R. A Greener Approach to Spinach Farming: Drip Nutrigation with Biogas Slurry Digestate. Agronomy 2024, 14, 681.

Abstract

To achieve higher crop yields and maintain environmental conservation, it becomes imperative to adopt novel agricultural methods that improve both the quantity and quality of produce. The above study focused on investigating the effectiveness of integrated use of biogas slurry (BS) and inorganic nutrigation on spinach growth and nutrient uptake through drip irrigation. Under field conditions and using a split plot design, spinach was cultivated with seven different treatments: biogas slurry nutrigation (BSN) (T1), integrated inorganic + organic nutrigation: 40% Recommended dose of fertilizer (RDF) +BSN (T2), 60% RDF +BSN (T3), 80% RDF +BSN(T4), 100% RDF(T5), slurry broadcasting (SB) (T6), and control(T7). The results showed that spinach grown with T4 80% RDF +BSN exhibited optimum plant height and leaf count compared to spinach under other treatments and was at par with T5 100% RDF for crop parameters. T5 treated plants demonstrated the longest roots, followed by T4 treated plants. The biomass produced by T4 was at par with T5 in the first (T4= 4.60 tonha-1, T5 =4.67 tonha-1) and second harvesting(T4= 6.69 tonha-1, T5 =6.89 tonha-1).In terms of macronutrient content in spinach leaves, significant differences were found only for nitrogen (N),potassium (K), while the phosphorus contents were not significantly influenced. Incorporating biogas slurry into the soil modifies microbial enzyme activities, specifically dehydrogenase and phosphatase. Normally, alkaline phosphatase shows greater activity than acidic phosphatase, but the addition of biogas slurry equalized the enzymatic activity of both, establishing a harmonized enzymatic profile. Fertilizing spinach with integrated Biogas slurry nutrigation + inorganic nutrigation not only improves growth and development to a similar extent as inorganic fertilizer but also enhances the nutrient content of the spinach, contributes to environmental preservation, and reduces production costs.

Keywords

Biogas slurry; Drip; Nutrigation; Spinach; Phenology; Nutrient uptake; Microbial properties

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

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