Table 4 Grain protein content (%) and content oil (%) of maize as affected by irrigation intervals and foliar application of K-silicates in the 2017 and 2018 seasons.

From: Increase maize productivity and water use efficiency through application of potassium silicate under water stress

Treatments

2017

2018

Characters

Irrigation intervals (I)

Foliar application of K-silicate (K2SiO3)

L.S.D.0.05

Foliar application of K-silicate (K2SiO3)

L.S.D.0.05

S1 (once)

S2 (twice)

S3 (three times)

S4 (control)

Average (I)

I

S

I × S

S1 (once)

S2 (twice)

S3 (three times)

S4 (control)

Average (I)

I

S

I × S

Grain protein content (%)

I1 (10 days)

9.2

9.7

9.9

8.9

9.4

   

9.4

9.8

10.0

9.0

9.5

   

I2 (15 days)

9.6

9.8

11.0

10.0

10.1

0.5

0.7

1.1

10.1

10.5

11.2

9.2

10.2

0.4

0.6

1.0

I3 (20 days)

9.7

10.2

10.4

8.9

9.8

   

10.0

10.1

10.1

8.8

9.8

   

Average

9.5

9.9

10.5

9.3

    

9.8

10.1

10.4

9.0

    

Grain oil content (%)

I1 (10 days)

3.6

3.6

3.9

3.3

3.6

   

3.6

3.6

3.9

3.4

3.6

   

I2 (15 days)

3.4

3.5

3.7

3.4

3.5

0.3

0.4

0.5

3.4

3.6

3.8

3.5

3.6

0.3

0.3

0.6

I3 (20 days)

3.3

3.3

3.2

3.2

3.3

   

3.3

3.2

3.3

3.3

3.3

   

Average

3.4

3.5

3.6

3.3

    

3.5

3.5

3.7

3.4

    
  1. I1, I2, and I3: irrigation intervals treatments; S1,S2, S3 and S4: foliar application of K-silicate treatments; L.S.D.at 5%, the least significant difference at a 5% level of significance.