tips & tricks
WHY TEST SOIL ?
Without knowing basic properties like the nutrient levels , organic matter content , and acidity or alkalinity levels of a soil or growing medium , it is difficult or even impossible to know what needs to be added to the soil for its optimal health . Growers that routinely add various fertilizers or amendments like lime to their soil may be spending money needlessly and , worse , may be building nutrients in the soil to near-toxic levels . Every crop has unique nutrient needs and thrives in unique soil conditions . By performing a soil test , growers will learn what is already in their soil in sufficient amounts and what precisely has to be added . Soil testing will reveal the soil ’ s pH level , organic matter , levels of several different nutrients , cation exchange capacity ( CEC ), and presence of heavy metals . Some may even help to identify how much sand or clay is present .
COLLECTING THE SAMPLE ( S )
Whether growers intend to test the soil themselves or send it to a lab for professional analysis , a sample still
“ By performing a soil test , growers will learn what is already in their soil in sufficient amounts and what precisely has to be added .”
needs to be collected . It should not be assumed that the properties of the soil are consistent throughout . Even in small garden areas , it is advised to take several samples and mix them to achieve a composite . There is no minimum number of samples , but there should be no less than one sample per 1,000 square feet of growing area to get an accurate picture . If there are different growing areas or different fields in question , separate samples should be prepared . When taking a sample , it is important not to contaminate it . Growers should use a clean bucket , a clean trowel , and wear gloves . Also , the sample should be taken from soil that is approximately six to eight inches below the surface . It is important not to include any of grass or mulch that had to be cleared away to obtain the sample . Once all the samples are collected , stir them together using the same tool used to collect the samples . A portion of this blend will be used for the test . If using the services of a cooperative extension , they will generally provide a collection bag that indicates how much soil to fill it with . In general , only about one cup of soil is needed per sample area .
74 grow cycle