Nutrient Management for Litchi in Guangdong

Application ratio of N/K2O

IPNI-2009-CHN-GD12

Litchi is one of the most favorable subtropical fruits grown in China. To get high yields and quality of litchi, special care is needed for its mineral nutrition. Among all the essential nutrients, insufficient or over supply of N or K, or using improper fertilizer ratios of K2O/N, usually reduces litchi yield and quality. High fertilizer K2O/N ratios are known to cause fruit cracking, which results in economic loss to the growers. Read more


Year of initiation:2009
Year of completion:2012

Interpretive Summary

Litchi is one of the most favorable subtropical fruits grown in China. To get high yields and quality of litchi, special care is needed for its mineral nutrition. Among all the essential nutrients, insufficient or over supply of N or K, or using improper fertilizer ratios of K2O/N, usually reduces litchi yield and quality. High fertilizer K2O/N ratios are known to cause fruit cracking, which results in economic loss to the growers.

This 3-year study, initiated in 2009, aimed to investigate the effect of different ratios of K to N on litchi yield and quality in Guangdong province. There were five K: N ratios employed ranging from 0. 6 to 1. 2 based on the fixed N rate of 500 kg N/ha and P rate of 150 kg P2O5/ha. Appropriate amounts of Ca, Mg, Zn, B, and Mo fertilizers were added to each treatment as identified by soil test and previous studies. The popular litchi cultivar, Feizhixiao, was selected for the field experiment.

The objectives of this study aimed to investigate the effect of K, Ca, Mg, B, and Mo fertilizers on litchi yield and quality in Guangdong as follow-up research to previous work done on the crop’s nutrient requirement and allocation. A representative litchi cultivar, Feizhixiao, was selected for this field experiment. Except for K fertilizer, which was incorporated into soil, all other nutrients were foliar-applied across three times (before blossom, at young fruit set, and fruit expansion).

The objectives of this study were to understand nutrient requirement and allocation in litchi as well as its rooting soil volume. To fulfill these objectives, two representative types of 15-year-old adult litchi trees (Guiwei and Feizhixiao) were dug out from two well-managed litchi plantations before harvest. Root length, weight, and spatial distribution in the soil were measured, and nutrient uptake and allocation within the plant were analyzed.

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Project Leader

Lixian Yao, Guangdong Academy of Agricultural Sciences


Project Cooperators

Li, Guoliang


IPNI Staff

Shihua Tu


Location

Asia \ Eastern Asia \ CHN \ Guangdong \ Maomin


Topics

4r rate, nutrient management

fruit

Nitrogen (N), Potassium (K)