Abstract
A two-season field trial was carried out in the Upland Crop Experiment Field of the Faculty of Agronomy, Vietnam National University of Agriculture (VNUA) to assess the effects of three furrow heights (20, 35, and 50cm) and three manure compost levels (15, 25, and 35 tons ha-1) on the growth, yield, and quality of green asparagus (Asparagus officinalis L.) grown organically. The experiments were arranged in a randomized completely block design (RCBD) with three replications. The results showed that the harvested yield was highest (11.3 and 25.1 quintals ha-1 in the 2019 autumn and 2020 spring season, respectively) in the treatment with a furrow height of 35cm and compost level of 35 tons ha-1 in both seasons, and explained by the increased spear diameters and number of spears per plant in this treatment when the furrow height and compost level were increased. Additionally, the chlorophyll content, water loss, and dry matter weight of the spears also increased when the furrow height and compost level increased. The obtained quality of the spears under organic management at the furrow height of 35 cm and compost level of 35 tons ha-1 was higher than the other treatments with higher reducing sugars, vitamin C, and Brix values, while the residue nitrate contents of all the treatments were lower than the allowed safety threshold.
Highlights
Asparagus (Asparagus officinalis L.) is a perennial crop and a nutritious vegetable that is good for human health because it is rich in minerals, vitamins, amino acids, and fiber (Hamdi et al, 2018)
The increments of manure compost dose and furrow height did not influence the heights of the spears (Figure 1A), while in the 35 tons ha-1 manure compost treatment (P3), when the furrow height increased from 20cm (L1) to 35cm (L2), the spear diameter significantly increased but when the furrow height increased to 50cm (L3), the diameter did not change (Figure 1B)
Asparagus spear diameter increased when the furrow height reached 35cm, but increasing the height to 50cm the did not increase the diameter of the spears, while the highest level of manure compost (50 tons ha-1) gave the highest spear diameters
Summary
Asparagus (Asparagus officinalis L.) is a perennial crop and a nutritious vegetable that is good for human health because it is rich in minerals, vitamins, amino acids, and fiber (Hamdi et al, 2018). Such as phenols, carotene oligosacharides, and rutin. Organic farming is currently a very promising production method because it produces high-quality products and contributes to improving the health of soil, ecosystems, and humans (IFOAM, 2005). Several studies have shown that the benefits of compost supplementation include improved soil chemical properties, buffering capacity, cation exchange capacity (CEC), soil fertility, supply nutrition levels, especially N, P, K, Ca, and Fe (Bruun et al, 2006), and biological properties (Garcia-Gil et al, 2000)
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