Abstract:

The research aims to improve the yield and quality of navel orange fruit by organic fertilizer and microbial inoculants application, thus providing a technical basis for soil environment improvement and navel orange green plantation in Xinning County of Hunan Province. The authors used ‘7904’ navel orange as the test material and carried out a field plot experiment, three different fertilization treatments were set up, namely the organic fertilizer (T1), organic fertilizer+ microbial inoculants (T2), conventional chemical fertilization (T3), to measure relative indexes of fruit yield and quality. The results showed that compared with T3, the yield, average fruit heavy, reducing sugar content and sugar-acid ratio of navel orange obviously increased by 6.88%, 20.41%, 12.54%, 0% respectively in 2019 and 6.03%, 6.19%, 72.16%, 59.50%, respectively in 2020 by using the organic fertilizer (T1), and 6.18%, 26.60%, 12.85%, 0% respectively in 2019 and 5.12%, 10.76%, 69.68%, 55.34% respectively in 2020 by using the organic fertilizer+ microbial inoculants (T2). The edible rate of T2 was increased by 6.72% in 2019 and 5.73% in 2020 compared with T3 and 7.63% in 2019 and 6.78% in 2020 compared with T1. Considering the fruit yield and quality, the application of organic fertilizer+ microbial inoculants is the optical treatment. The field experiments indicate that using organic fertilizer+ microbial inoculants could not only improve the fruit yield and quality, but also substitute for chemical fertilizer application to prevent its pollution.

Key words: organic fertilizer, microbial inoculants, navel orange, yield, quality