Table 7 Effect of POLY4 on physico-chemical properties and soil fertility status.

From: Polyhalite as an alternate nutrient source for improving growth, yield, and nutrient use efficiency in onion and garlic

Treatments

Soil pH

EC (dS m–1)

SOC (g kg–1)

Soil available nutrients

N (kg ha–1)

P (kg ha–1)

K (kg ha–1)

S (mg kg–1)

2022–2023

2023–2024

2022–2023

2022–2023

2023–2024

2022–2023

2023–2024

2022–2023

2022–2023

2023–2024

2022–2023

2022–2023

2023–2024

2022–2023

Onion

100% K alone (No S)

8.40 ab

7.92 b

0.23 b

0.22 f

5.47 c

4.93

61.1 a

64.8 a

12.5 a

16.6 b

177.9 cd

221.7 a

11.1 bc

10.9 e

100% S alone (No K)

8.32 abc

7.85 c

0.22 b

0.27 c

5.42 cd

4.87

59.2 a

64.8 a

11.7 a

16.9 ab

185.4 bc

213.4 a

11.1 bc

11.2 de

100% K (MOP) and S (BS)

8.38 ab

7.82 c

0.25 b

0.25 d

5.28 cd

4.93

61.1 a

64.8 a

10.7 a

17.3 a

200.9 b

208.5 a

11.1 bc

12.4 c

75% S (POLY4)

8.26 bc

7.91 b

0.22 b

0.24 e

5.18 d

5.37

62.9 a

66.6 a

11.8 a

15.6 d

185.4 bc

210.9 a

11.1 bc

11.7 d

100% S (POLY4)

8.20 c

7.94 b

0.31 a

0.22 f

5.32 cd

4.93

62.9 a

61.1 a

11.4 a

15.8 cd

198.4 b

208.5 a

12.0 ab

12.6 bc

150% S (POLY4)

8.28 abc

7.93 b

0.23 b

0.29 b

5.39 cd

5.43

64.8 a

61.1 a

10.3 a

16.3 bc

165.5 d

209.0 a

12.4 ab

12.4 c

75% S (POLY4) + K (MOP)

8.36 abc

8.00 a

0.23 b

0.18 g

5.26 cd

5.27

61.1 a

64.8 a

12.2 a

16.6 b

174.1 cd

213.9 a

13.4 a

13.1 ab

100% S (POLY4) + K (MOP)

8.42 a

7.92 b

0.14 c

0.30 a

6.11 a

5.23

62.9 a

66.6 a

11.6 a

15.8 cd

225.3 a

209.6 a

10.0 c

12.8 abc

150% S (POLY4) + K (MOP)

7.99 d

7.89 b

0.25 b

0.26 d

5.74 b

4.93

44.4 a

62.9 a

11.1 a

17.3 a

183.9 bc

213.3 a

13.4 a

13.4 a

P value

0.19

0.05

0.6

0.01

0.02

0.02

NS

NS

NS

0.9

15.8

NS

3.1

0.6

CV (%)

1.39

0.34

14.19

2.04

2.54

2.32

14.3

5.1

9.8

3.2

5.0

3.8

7.9

2.7

Garlic

              

100% K alone (No S)

8.40 abc

8.01 a

0.19 a

0.26 a

5.11 cd

5.23 d

62.9 a

55.5 c

11.2 a

18.6 c

161.1 cde

211.9 b

12.00 a

10.91 b

100% S alone (No K)

8.37 bcd

7.86 f

0.18 a

0.23 b

4.96 d

4.93 e

62.9 a

55.5 c

11.3 a

19.3 bc

152.1 e

206.0 b

11.21 a

12.39 a

100% K (MOP) and S (BS)

8.27 de

7.96 cd

0.23 a

0.26 a

5.42 b

6.23 a

61.1 a

61.1 a

12.0 a

19.2 bc

189.1 a

217.4 b

13.86 a

11.06 b

75% S (POLY4)

8.35 cd

8.01 ab

0.20 a

0.22 c

5.79 a

5.73 c

62.9 a

61.1 a

10.1 a

19.9 ab

153.0 e

217.4 b

11.71 a

9.96 d

100% S (POLY4)

8.20 e

7.98 abc

0.18 a

0.20 d

5.00 d

5.93 bc

57.4 a

61.1 a

11.9 a

19.3 bc

189.8 a

217.1 b

11.85 a

12.39 a

150% S (POLY4)

8.42 abc

7.89 ef

0.21 a

0.20 e

5.26 bc

5.97 bc

61.1 a

59.2 ab

11.9 a

19.3 bc

175.1 bc

215.2 b

12.36 a

9.88 d

75% S (POLY4) + K (MOP)

8.47 ab

7.98 abc

0.18 a

0.19 f

5.12 cd

5.87 bc

62.9 a

59.2 ab

9.9 a

18.6 c

152.5 e

241.3 a

11.42 a

10.69 bc

100% S (POLY4) + K (MOP)

8.47 ab

7.93 de

0.19 a

0.19 f

5.16 cd

6.03 ab

62.9 a

57.4 bc

11.0 a

20.4 a

156.1 de

214.6 b

10.34 a

10.18 cd

150% S (POLY4) + K (MOP)

8.50 a

7.97 bc

0.19 a

0.21 d

5.47 b

5.43 d

61.1 a

61.1 a

10.7 a

20.3 a

168.5 cd

214.3 b

12.72 a

10.91 b

P value

0.10

0.04

NS

0.01

0.03

0.02

NS

3.2

NS

0.7

20.3

13.7

NS

0.68

CV (%)

0.73

0.28

11.03

1.47

2.93

2.46

5.1

3.2

11.6

2.0

7.3

3.7

9.73

3.58

  1. Different lowercase letters indicate significant differences (P < 0.05) among treatments. 100% K (MOP) and S (BS): 100% recommended potassium applied through muriate of potash and sulfur through bentonite sulfur.
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