waht kind sensor can measure the nutrients of the soil?

hi i am zain from indonesia, i have a problem to measure the soil nutrients, my project abaout plant care but i dont know what kind sensor can measure the soil nutrients,

this is one of example plant care from Xiaomi
http://xiaomi-mi.com/mi-smart-home/xiaomi-huahuacacao-flower-care-smart-monitor/

from the xiaomi smart flower care there is only one sensor to measure the soil moisture and soil nutrient,

can anyone tell me how to do that? or what sensor can i use for my project to measure the soil nutrient?

Thank's

Plants need lots of different nutrients, and an expensive chemical test is required to determine how much of each nutrient is in soil.

The only soil sensor you can buy for Arduino is a moisture sensor.