Analysing soil pH and organic matter

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Source:

https://www.accessagriculture.org/analysing-soil-ph-and-organic-matter

Duration: 

15:04:00

Year of Production: 

2023

Source/Author: 

Agro-Insight
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As a factor of crop production, soil need to be analysed by the farmer to determine the crop which suits the nutrients and pH available. Being a measure that indicate if soil is acidic, neutral or alkaline, a farmer need to know the status of the soil and the amount of organic matter it has. Because acidic soil inhibit bacteria that help to decompose organic matter and make nutrients less available to crops, soil become acidic when there use of chemical fertilizers.

Soil management

Because a good soil has orgainic matter which hold more water, always use a standard method to sample soil and remove a block of soil with a spade and mix it and remove any stones. Keep about 1 kg of soil to do test as pH is measured using pH metre scale from 0-14 and 7 is neutral
Equally, acidic soils have value below 6 and alkaline soil have value above 8 ans most crops grow well in pH of 5.5-7.5. Fill glass to 2cm of soil, add water to 4cm high and stir for a minute and let it settle for 2 minutes and submerge pH paper in water with soil for 10 seconds and compair with pH chart to determine pH.
Add ash or agricultural lime to acidic soil and add compost, animal manure or chicken manure to alkaline soils  to measure particulate organic matter, use need a wash bottle.
Furthermore, prepare small plastic water bottle with between 100-150mm hole near bottom of bottle and make a 15*20cm sack that let water and clay pass through. Find a cloth with mesh of 1/4 mm, put bottle with holes inside bag of cloth, weigh 100g of soil from sample got from field and submerge bag with bottle in bucket of water and wash the soil until no more soil come out of bottle and remember not use soil which is free of stones.
As you discard all the remaining debris inside bottle, transfer all contents of bag with water and particultae organic matter will float and sand will settle at the bottom. Floating organic matter is poured on the ordinary cloth that let  waqter pass through quickly.
Also repeat the process untill no more organic matter floating and dry particles of organic matter and measure once dry as a circle of 3-7cm means soil has medium level of organic matter and a circle of 2 cm indicate low organic soil matter.
Finally, add manure and compost or rotate with legumes and also mulch to increase organic matter.
Sequence from Sequence to Description
00:0000:53Always know your soil whether it is a cidic and the amount of organic matter it has.
00:5401:02pH is a measure that indicate if soil is adic, neutral or alkaline.
01:0301:35Soil become acidic when use of chemical fertilizer.
01:3603:22A good soil has organic matter which hold more water.
03:2303:46Use a standardised method to sample soil.
03:4704:27Remove a block of soil and collect from 5 points and mix it.
04:2804:37Keep a kg of soil to do test.
04:3805:21Soil pH is measured using pH metre scale.
05:2206:12Acidic soil has values below 6 and alkaline soil have value abover 8.
06:1306:52Fill glass with soil, add water and stir for a minute and let it settle.
06:5307:16Submerge pH paper in soil water for 10 seconds and compair with pH chart.
07:1707:42Add ash or lime to acidic soil and compost to alkaline soils.
07:4308:06To measure particulate organic matter, you need a wash bottle.
08:0708:40Prepare small plastic water bottle and make a sack that let water and clay pass through.
08:4108:52Find a cloth with mesh.
08:5309:09Put bottle inside bag or cloth, weigh soil from sample got from field.
09:1009:50Submerge bag with bottle in bucket of water and wash the soil.
09:5110:12Put bag in another bucket until water remains clear.
10:1310:38Discard the remaining debris inside bottle and transfer all contents.
10:3910:52Particulate organic matter will float and sand will settle.
10:5311:06Floating orgainc matter is poured on a piece of ordinary cloth.
11:0711:28Repeat the process until no more organic matter floating.
11:2911:44Dry particles of organnic matter and measure once dried.
11:4511:54If the circle of organic matter measure 7cm, particulate of organic matter is high.
11:5512:03A circle of 3-7cm means that soil has medium level of organic matter.
12:0412:11Circle of 2cm indicate low organic soil matter.
12:1212:32Add manure and compost or rotate with legumes and.
12:3315:04Summary

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