1. The effect of humic acid and bio-fertilizer on the growth of strawberry.

Application and Effect of Humic Acid on StrawberryThe plant height of strawberry was significantly increased by applying humic acid plus biological fertilizer.  The average plant height was 18.87 cm. There was no significant difference in strawberry plant height after applying humic acid or biological fertilizer alone.  But the effect of topdressing on leaf area was not significant.

Both single application and mixed application of two fertilizers could significantly increase the single fruit weight of strawberry at the full fruit stage and the last fruit stage. The average fruit weight of strawberry was 50.27 g.  If only humic acid, the average fruit weight per fruit was 49.36 g. Compare the average lowest fruit weight, among which the three fertilizer treatments were 8.85%, 14.12% and 16.23% enhanced, respectively.

At the end of the fruit stage, there was no significant difference in the average fruit weight per plant among the three treatments. But there was significant difference in the number of fruit per plant among the three treatments. And the average fruit number per plant was 8.30%, 8.26% and 8.56%enhanced, respectively, which was significantly higher.

It can be seen that the application of humic acid and biological fertilizer can significantly increase the overall growth of strawberry.  Especially the weight per fruit and the number of fruit per plant.  Then increase the yield of strawberry.

2. Effect of humic acid and biological fertilizer on the incidence of strawberry diseases.

Application of humic acid and biological fertilizer can significantly reduce the rates of powdery mildew of enough. The disease of powdery mildew were 7.3%, 6.8% and 5.4%, respectively.  3.6%, 4.1% and 5.5% lower compared. Two kinds of fertilizer is used at the same time, the low incidence of strawberry powdery mildew. Significantly lower than single application.

Applying humic acid and biological fertilizer significantly reduced the disease of grey mold in strawberry.  Which was 7.1%, 5.9% and 5.0%, respectively. 4.1%, 5.3% and 6.2% lower compared. The same application of humic acid and biological fertilizer also significantly reduced the disease of strawberry rot.

3. Effect of humic acid and biofertilizer on the yield of strawberries.

Application and Effect of Humic Acid on StrawberryThe application of the humic acid and biological fertilizer significantly improves the yield of the strawberry. Where in the yield of the strawberry is the highest with the two kinds of fertilizers. the yield is 1687.44 kg/ 667m-2.

But the yield of the strawberry is not significantly different from the yield of the strawberry when the humic acid and biological fertilizer is applied separately. But the yield of the strawberry is obviously higher than that of the single application of the biological fertilizer compared.

The application of humic acid and the application of humic acid and bio-fertilizer three treatments increased the yield of strawberry by 7.70%, 10.80% and 14.70%, respectively.

4. Effects of humic acid and biological fertilizer on strawberry quality.

Humic acid and biological fertilizer could significantly increase the protein content of strawberry. The highest protein content of strawberry was 11.33 g/ kg-1.

But there was no significant difference between humic acid and biological fertilizer. But the effect of humic acid and biological fertilizer on Vc content of strawberry was similar to that of protein. The Vc content of the three fertilizer treatments was 16.74%, 11.51% and 25.91% higher compared, respectively.

The application of humic acid and biological fertilizer significantly increased the content of soluble sugar. The content of soluble sugar in strawberry was the highest and the content of soluble sugar increased by 2.93%. There was no significant difference in soluble sugar content between humic acid alone and biological fertilizer alone, but it was significantly higher than compared, which was 1.96% and 2.43% higher, respectively.

The application of humic acid and biological fertilizer could significantly reduce the free acid content of strawberry, and then increase the ratio of sugar to acid. Among them, the ratio of sugar to acid of strawberry was the highest and the taste was the best, followed by strawberry with humic acid.