Effect of LED spectra (red: blue ratios) on morphological and physio-biochemical performance of pak choi (Brassica rapa var. chinensis (L.) Hanelt) grown under controlled environment multi-tier hydroponic production system. - Mahesh R; Hasan M; Singh DK; Sahoo RN; Kumar SN; Yeasin M (Plant physiology and biochemistry : PPB, 2025)