Abstract
In this study, we investigated nutrient uptake, partitioning, and production of two subspecies of Brassica in response to nutrient solution concentration in floating hydroponics systems. This study used a complete randomized block design factorial with two factors. The first factor was two Brassica subspecies consisting of Brassica rapa subsp. chinensis (Pak Choi) and Brassica rapa var. parachinensis (Choy Sum). The second factor was the concentration level consisting electrical conductivity (EC) 1 mS cm-1 and EC 2 mS cm-1. The results indicated the absorption rates of nitrogen (N,) phosphorus (P), and potassium (K) in leaves, roots and stems were similar in both nutrient concentrations. In general, all combination treatments resulted more accumulation of P followed by N, also K as the smallest proportion. P was mostly accumulated at the root and leaves (19.60 to 25.90 mg g-1), while majority of N was collected in leaves ranging from 18.00 to 24.30 mg g-1. The highest K content was detected in the stem (10.70 to 14.20 mg g-1). P uptake was 1.69 to 2.47 times higher than K, while N uptake was 1.44 to 2.04 times higher than K. Both two subspecies and concentrations performed no significant effects on nutrient uptake. Although same species, the plant growth parameters of Pak Choi and Choy Sum are very different including plant height, leaves number, width and length. Both two subspecies adapted well with both concentrations. However, significant differences were recorded in the combination of subspecies and nutrient concentration on plant growth and production parameters. To achieve higher market portion, Pak Choi would be more suitable to be planted on EC 1 mS cm-1, while Choy Sum was favorable at both concentrations.
Highlights
Vegetable production needs to be supported using technology to ensure fulfillment of food and to ensure sustainable supply to the market.Conventional cultivation techniques that have been widely used are very volatile due to environmental factors
The distribution of nutrients in the Brassica species exhibited a different pattern with the partitioning of nutrients in oil palm seedlings
While majority N was collected in leaves ranging from 18.00mg g-1 to 24.30 mg g-1
Summary
Vegetable production needs to be supported using technology to ensure fulfillment of food and to ensure sustainable supply to the market.Conventional cultivation techniques that have been widely used are very volatile due to environmental factors. Conventional technology is known to have weaknesses due to excessive and inaccurate. For this reason, hydroponics is needed to overcome these weaknesses. Hydroponics technology (oilless culture) offers solutions to increase agricultural production. Hydroponics has increased agricultural production throughout the world because this technology enables better efficiency of nutrients and water use as well as climate control and crop protection. One of the most developed hydroponics is the floating system. This system is considered to be easier in application and can be applied in a household scale. Floating hydroponics system can provide the nutrients required by plants, because the submerged roots can uptake nutrient elements from the solution and continuously (Subandi et al, 2015)
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