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Table 6 Summary description of the application of compost, phosphate rock, liquid fertilizer (LF) and biochar into different treatments

From: Effect of rubber wood biochar on nutrition and growth of nursery plants of Hevea brasiliensis established in an Ultisol

Trt.No.

Basal application§

Treatment

Abbreviation

Compost

Phosphate rock

Liquid fertilizer†

Biochar‡

N

P

K

Mg

1

50 g

50 g

-

-

-

-

0%

0% biochar + no LF

2

50 g

50 g

√

√

√

√

0%

0% biochar + N-P-K-Mg

3

50 g

50 g

-

-

-

-

1%

1% biochar + no LF

4

50 g

50 g

√

-

-

√

1%

1% biochar + N-Mg

5

50 g

50 g

-

-

-

-

2%

2% biochar + no LF

6

50 g

50 g

√

-

-

√

2%

2% biochar + N-Mg

  1. § Compost and phosphate rock, 50 g each, were applied into a polybag at bag filling stage.
  2. † LF were applied (√) at two-week intervals at rates recommended by the Rubber Research Institute of Sri Lanka (Samarappuli, 2001). N, P, K and Mg were supplied as sulfate of ammonia, di-ammonium phosphate, sulfate of potash and commercial epsom salt, respectively.
  3. ‡ Biochar (w/w) were mixed with soil, together with compost and phosphate rock, at bag filling stage.
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