Nroj tsuag tseem ceeb cov as-ham yog cov khoom lossis cov khoom sib txuas uas tsim nyog rau cov nroj tsuag kev loj hlob, kev loj hlob, thiab kev loj hlob. Cov kev xav tau ntawm cov as-ham sib txawv thiab ua lub luag haujlwm tseem ceeb hauv ntau yam txheej txheem physiological thiab biochemical hauv cov nroj tsuag. Raws li cov nroj tsuag xav tau ntau npaum li cas, cov as-ham tseem ceeb feem ntau muab faib ua ob pawg loj: macronutrients thiab micronutrients.
Main macronutrients:
Nroj tsuag xav tau ntau npaum li cas ntawm cov as-ham.
Carbon (C): Tau txais los ntawm carbon dioxide thaum lub sij hawm photosynthesis, nws tsim cov pob txha ntawm cov organic tebchaw.
Hydrogen (H): Tau los ntawm dej, nws yog ib feem ntawm cov organic tebchaw.
Oxygen (O): Tau txais los ntawm carbon dioxide thiab dej, nws yog qhov tseem ceeb rau kev ua pa thiab photosynthesis.
Nitrogen (N): Qhov tseem ceeb rau kev tsim cov proteins, nucleic acids, thiab chlorophyll.
Phosphorus (P): Qhov tseem ceeb rau cov khoom siv xws li hloov hluav taws xob (ATP), nucleic acid synthesis, thiab cell membranes.
Potassium (K): Ua lub luag haujlwm hauv kev tswj dej, ua kom enzyme, thiab tag nrho cov nroj tsuag loj hlob thiab kev loj hlob.
Secondary Macronutrients:
Nroj tsuag xav tau cov as-ham tsawg dua li macronutrients tab sis ntau dua micronutrients.
Calcium (Ca): Ib qho tseem ceeb rau kev tsim cov phab ntsa ntawm tes, enzyme muaj nuj nqi, thiab tag nrho cov nroj tsuag kev ncaj ncees.
Magnesium (Mg): Cov ntsiab lus tseem ceeb ntawm chlorophyll, uas yog qhov tseem ceeb rau photosynthesis thiab enzyme activation.
Sulfur (S): Tsim nyog rau amino acid synthesis thiab protein qauv.
Micronutrients:
(tseem hu ua trace elements): Cov as-ham no tsawg dua tab sis tseem ceeb heev.
Hlau (Fe): Ib qho tseem ceeb rau chlorophyll synthesis thiab electron thauj hauv photosynthesis.
Manganese (Mn): Koom nrog hauv photosynthesis, enzyme activation, thiab nitrogen metabolism.
Zinc (Zn): Yuav tsum muaj rau kev ua haujlwm enzyme, auxin synthesis, thiab kev loj hlob tag nrho.
Copper (Cu): Koom nrog hauv kev ua kom enzyme thiab kev thauj khoom hluav taws xob.
Boron (B): Yuav tsum tau tsim cov phab ntsa ntawm tes, thauj cov piam thaj, thiab cov txheej txheem tsim tawm.
Molybdenum (Mo): xav tau rau nitrogen metabolism thiab enzyme muaj nuj nqi.
Chlorine (Cl): Koom nrog hauv photosynthesis thiab dej txav hauv cov nroj tsuag.
Nickel (Ni): Tsim nyog rau nitrogen metabolism, tshwj xeeb tshaj yog nyob rau hauv legumes.