Tiruvannamalai

• Nitrogen

  From 44,133 soil tests

  Poor
  Low 98% Medium 2%

  Almost every soil test here came out low

  If your field is low: add about a quarter more urea than the usual dose, in two or three splits. A pulse crop in rotation also adds nitrogen.

  What this means

  Grows leaves and stems. Short soil gives pale, yellow leaves.

  Low under 280 kg/ha Medium 280–560 kg/ha High over 560 kg/ha

  Healthy soil has 280 kg/ha or more.

  Compared with the wider area

  Place	Low	Medium	High
  Here	98%	2%	0%
  Tamil Nadu	99%	1%	0%
  India	65%	29%	6%

• Phosphorus

  From 44,162 soil tests

  Good
  Low 18% Medium 51% High 31%

  2 in 10 soil tests here came out low

  What this means

  Builds roots and helps the crop flower and fill grain.

  Low under 10 kg/ha Medium 10–25 kg/ha High over 25 kg/ha

  Healthy soil has 10 kg/ha or more.

  Compared with the wider area

  Place	Low	Medium	High
  Here	18%	51%	31%
  Tamil Nadu	21%	43%	36%
  India	13%	41%	45%

• Potassium

  From 44,191 soil tests

  Good
  Low 19% Medium 68% High 13%

  2 in 10 soil tests here came out low

  What this means

  Fills grain and fruit, and helps crops stand drought and disease.

  Low under 110 kg/ha Medium 110–280 kg/ha High over 280 kg/ha

  Healthy soil has 110 kg/ha or more.

  Compared with the wider area

  Place	Low	Medium	High
  Here	19%	68%	13%
  Tamil Nadu	11%	43%	46%
  India	14%	53%	33%

• Organic carbon

  From 44,078 soil tests

  Poor
  Low 93% Medium 6% High 1%

  9 in 10 soil tests here came out low

  If your field is low: add 4 tonnes of compost or farmyard manure per acre before sowing, and plough crop leftovers back in instead of burning them.

  What this means

  Shows how much organic matter the soil has. It keeps soil loose, holds water and feeds the crop slowly.

  Low under 0.5% Medium 0.5–0.75% High over 0.75%

  Healthy soil has 0.5% or more.

  Compared with the wider area

  Place	Low	Medium	High
  Here	93%	6%	1%
  Tamil Nadu	88%	9%	3%
  India	49%	28%	23%

• pH

  From 43,871 soil tests

  Good
  Acidic 1% Neutral 97% Alkaline 1%

  Almost every soil test here came out neutral

  What this means

  How sour (acidic) or alkaline the soil is. It decides which nutrients roots can take up.

  Acidic Neutral Alkaline

  In these tests, neutral means about pH 6 to 8, which suits most crops; acidic is below about 6 and alkaline above about 8.

  Compared with the wider area

  Place	Acidic	Neutral	Alkaline
  Here	1%	97%	1%
  Tamil Nadu	2%	93%	5%
  India	11%	86%	2%

• Salt

  From 43,983 soil tests

  Good
  Not salty 100%

  Almost no soil tests here came out salty

  What this means

  Salt in the soil, shown as EC on the card. Salt makes it hard for roots to drink.

  Not salty Salty

  Under 1 dS/m is fine. Between 1 and 4, only crops that can't take salt lose yield. Above 4 harms most crops.

  Compared with the wider area

  Place	Not salty	Salty
  Here	100%	0%
  Tamil Nadu	98%	2%
  India	96%	4%

• Sulphur

  From 44,199 soil tests

  Okay
  Short 40% Enough 60%

  4 in 10 soil tests here came out short

  If your field is short: use single super phosphate instead of DAP, or add about 100 kg of gypsum per acre before sowing.

  What this means

  Makes oil in oilseeds and protein in pulses.

  Short under 10 ppm Enough 10 ppm or more

  Healthy soil has 10 ppm or more.

  Compared with the wider area

  Place	Short	Enough
  Here	40%	60%
  Tamil Nadu	35%	65%
  India	24%	76%

• Zinc

  From 44,252 soil tests

  Poor
  Short 60% Enough 40%

  6 in 10 soil tests here came out short

  If your field is short: mix 10 kg of zinc sulphate per acre into the soil before sowing. One dose lasts two or three seasons.

  What this means

  Needed for growth and healthy leaves. Rice and wheat often run short.

  Short under 0.6 ppm Enough 0.6 ppm or more

  Healthy soil has 0.6 ppm or more.

  Compared with the wider area

  Place	Short	Enough
  Here	60%	40%
  Tamil Nadu	42%	58%
  India	35%	65%

• Iron

  From 44,277 soil tests

  Okay
  Short 22% Enough 78%

  2 in 10 soil tests here came out short

  If your field is short: spray ferrous sulphate, 5 g per litre of water, when young leaves turn yellow.

  What this means

  Keeps young leaves green.

  Short under 4.5 ppm Enough 4.5 ppm or more

  Healthy soil has 4.5 ppm or more.

  Compared with the wider area

  Place	Short	Enough
  Here	22%	78%
  Tamil Nadu	37%	63%
  India	24%	76%

• Copper

  From 44,189 soil tests

  Good
  Short 1% Enough 99%

  Almost every soil test here had enough

  What this means

  Helps the crop set seed and resist disease.

  Short under 0.2 ppm Enough 0.2 ppm or more

  Healthy soil has 0.2 ppm or more.

  Compared with the wider area

  Place	Short	Enough
  Here	1%	99%
  Tamil Nadu	3%	97%
  India	5%	95%

• Boron

  From 44,231 soil tests

  Okay
  Short 43% Enough 57%

  4 in 10 soil tests here came out short

  If your field is short: mix 4 kg of borax per acre into the soil before sowing.

  What this means

  Needed for flowers to set seed and fruit.

  Short under 0.5 ppm Enough 0.5 ppm or more

  Healthy soil has 0.5 ppm or more.

  Compared with the wider area

  Place	Short	Enough
  Here	43%	57%
  Tamil Nadu	45%	55%
  India	44%	56%

The tests here for manganese look like a testing error: almost every test reads the same, unlike the districts around. They aren't used.

Fixes are the usual advice. Your Soil Health Card or nearest Krishi Vigyan Kendra gives the exact dose for your field.