赣南产区脐橙叶片大量和中量元素营养状况研究

Study on the contents of macronutrients and medium nutrients in Newhall navel orange leaves in southern Jiangxi province of China

通过对安远、信丰和南康等赣南8个县(市、区)122个脐橙园叶片大量和中量元素进行分析测试。结果表明,赣南脐橙叶片营养明显失衡,N和K含量很高,P和S比较适宜,Ca含量较低,而Mg含量严重不足。其中N、P、K、Ca、Mg和S平均值分别为:(3.12±0.22)%、(0.16±0.05)%、(2.10±0.28)%、(3.05±0.0.6)%、(0.20±0.08)%和(0.27±0.06%),且N和K处于高量及以上水平的比例分别为76.23%和100%,P和S在适宜范围的百分比分别为92.62%和86.89%,而Ca处于适宜和低量水平的比例分别为46.72%和53.28%,Mg在低量及以下水平的比例为87.70%。因此,赣南柑橘产区生产上需要大量补充Ca和Mg,同时减少施用N和K肥,以达到营养均衡的目的。

The contents of macronutrients and medium nutrient elements of Newhall navel orange （Citrus sinensis Osbeck） trees on trifoliate orange （Ponclrus trifoliate Raf.） rootstocks were investigated and analyzed, and 122 leaf samples were col- lected from 122 orchards in 8 counties in southern Jiangxi province of China. The results showed that the states of macro-ele- ments and medium elements in leaves were imbalance, and leaf N and K contents were very high, and leaf P and S contents were optimal. However, leaf Ca content was low, and leaf Mg was deficient. The contents of N,P,K,Ca,Mg and S were （3.12±0.22）%, （0.16±0.05）%, （2.10±0.28）%, （3.05±0.0.6）%, （0.20±0.08）% and （0.27±0.06）%, respectively. The orchard percentage of leaf N and K contents in high range and above was 76.23% and 100%, respectively. The percentage of orchards with leaf P and S contents in optimum range was 92.62% and 86.89%, respectively. However, the orchards with leaf Ca contents in low and deficient range took 46.72% and 53.28% , respectively, and Mg content in deficient range was 87.70%. It was recommended that Ca and Mg fertilizer should be added, while the N, P and K fertilizer should be decreased in order to balance the nutrients in leaves.