台农芒果叶片氮磷钾养分含量规律研究

The rules of nutrition contend of N P K in Tainong mango

通过对海南三亚市南田地区的台农芒果叶片氮、磷、钾3种元素含量的跟踪调查分析,结果表明：氮的年平均含量最高,钾含量次之,磷含量最低;台农芒果的生长周期划分为4个阶段：营养生长期（5～9月）,生殖生长期（9 ～10月）、果实膨大期（10月～次年1月）和果实成熟期（1～2月）.生长周期内,两篷叶的氮含量年变化呈现两头高、中间低的波浪状;磷含量均呈先升后降再上升的趋势;钾含量呈上升后持续下降趋势.营养生长期,第1篷叶磷含量高于第2篷叶;生殖生长期,第1篷叶钾含量低于第2篷叶;其它时期,第1篷叶氮、钾含量高,第2篷叶磷含量高.在不同的时期内,第1、2篷叶氮、磷、钾含量存在差异：两篷叶的氮含量在9、11、12、2月差异显著;磷含量在10月和次年2月差异显著;钾含量在10月差异显著.果树在10月对氮、磷、钾的需求量最大,生产上需注意在这段时间内及时补充氮、磷、钾.

With sampling and analysing the three nutrient elements,which contained nitrogen,phosphor,potassium,in Tainong mango leaves of different location in Nantian,Sanya,Hainan for almost a year,the results showed as follows：The annual average content in Tainong mango leaves were N ＞ K ＞ P.It could be divided the whole growth cycle of Tainong mango into four phases：vegetative growth phase,which was from May to September; reproductive growth phase,which was from September to October; fruit enlargement phase,which was from December to January; fruit maturation phase,which was from January to February.In different phases,the content of N of the both ends was higher than the middle＇s.The content of P increased firstly,then declined,and increased again at last.The content of K increased firstly,then declined.In vegetative growth phase,the content of P first location was higher than the second＇s.In reproductive growth phase,the content of K of the first location was lower than the second.In other phases,the content of N,K were higher of the first,and the content of P was lower.In different phases,we also found that the content of the three elements was different between the two locations,the content of N was 5％ significant difference in September,November,December and February.The content of P was 5％ significant difference in October and February.The content of K was 5％ significant difference in October.In the above months,famers need to fertilizing on time.