Table 2 The effect of organic amendments of compost and humic acid on shoot length, root length, grains pod⁻¹, and green pod yield of field pea.

Treatments	Shoot length (cm)	Root length (cm)	Grains pod⁻¹	Pod yield (kg ha⁻¹)
Winter field pea traits (the year 2017)
CK	78.5 ± 4.5e	15.3 ± 2.7b	4.8 ± 0.9a	612 ± 90g
4CP	94.3 ± 8.0d	21.5 ± 2.1a	5.5 ± 0.8a	930 ± 115f
6CP	95.4 ± 7.9d	20.5 ± 1.8a	7.3 ± 1.6a	1065 ± 102ef
8CP	95.7 ± 6.9d	21.3 ± 2.8a	8.3 ± 1.6a	1457 ± 135b–d
10HA	110.5 ± 5.3ab	21.6 ± 2.8a	7.7 ± 1.7a	1287 ± 87de
12HA	104.4 ± 4.4bc	20.7 ± 1.9a	8.4 ± 2.2a	1345 ± 105cd
15HA	96.7 ± 3.7d	19.6 ± 1.8ab	7.8 ± 1.8a	1330 ± 109cd
4CP + 10HA	98.4 ± 2.6cd	20.9 ± 1.8a	8.3 ± 2.2a	1540 ± 97bc
6CP + 12HA	98.3 ± 2.9cd	20.6 ± 1.9a	8.5 ± 2.2a	1680 ± 112b
8CP + 15HA	113.6 ± 4.3a	21.7 ± 1.8a	9.3 ± 2.3a	1995 ± 125a
Winter field pea traits (the year 2018)
CK	82.0 ± 4.2e	16.9 ± 2.3c	4.1 ± 0.8b	547 ± 90g
4CP	97.7 ± 8.2d	23.0 ± 2.4ab	7.0 ± 1.1ab	985 ± 105f
6CP	99.8 ± 7.7d	22.9 ± 1.6ab	9.8 ± 1.8ab	1135 ± 102d
8CP	100.7 ± 7.7d	24.3 ± 2.6a	10.4 ± 2.2ab	1522 ± 132cd
10HA	114.1 ± 5.0ab	23.9 ± 2.5ab	9.9 ± 1.2ab	1347 ± 90de
12HA	108.4 ± 4.5bc	22.7 ± 1.9ab	10.7 ± 1.8a	1402 ± 110d
15HA	100.4 ± 3.6d	21.5 ± 1.7b	9.9 ± 1.7ab	1387 ± 107d
4CP + 10HA	102.3 ± 3.0cd	22.9 ± 2.4ab	10.2 ± 2.7ab	1632 ± 90bc
6CP + 12HA	101.2 ± 2.4d	21.7 ± 1.9b	11.1 ± 2.4a	1772 ± 115b
8CP + 15HA	117.3 ± 4.4a	24.2 ± 2.5a	11.9 ± 2.0a	2135 ± 122a

Treatments: CK (Control, no amendments), 4CP (4 Mg ha⁻¹ compost), 6CP (6 Mg ha⁻¹ compost), 8CP (8 Mg ha⁻¹ compost), 10HA (10 kg ha⁻¹ humic acid), 12HA (12 kg ha⁻¹ humic acid), 15HA (15 kg ha⁻¹ humic acid), 4CP + 10HA (4 Mg ha⁻¹ compost + 10 kg ha⁻¹ humic acid), 6CP + 12HA (6 Mg ha⁻¹ compost + 12 kg ha⁻¹ humic acid) and 8CP + 15HA (8 Mg ha⁻¹ compost + 15 kg ha⁻¹ humic acid). Different letterings within a column exhibit substantial differences among the treatments and CK at a 5.0% probability level. Each value is Mean ± SD (n = 3).

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