问题 问答题 简答题

举例说明营养分配局限性在果树生产中的应用。

答案

参考答案:

分配的局限性指果树光合产物首先保证自身需要,如有富余则就近供应、蒹有同侧供应的现象。由此规律导致不同枝条类型营养特点的差异;一般长枝(营养枝)前期消耗多、后期光合产物生产也多、外运范围广,但运输量随距离增大而减少,其分布均匀对均衡树势意义重大;中枝只有季节性的调济作用;短枝则以自供为主。

改错题
此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画
一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词用斜线划掉,在该行右边横线上写出该词,并也用斜线划掉。
此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下画一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
Dear Jim,                                             
    I'd like to tell you something more about our school  
sports meet. It was holding on Oct. 6th, which was a  
fine day. There was over 1,000 students and teachers  
attend it. Wang Lin, a student from my class won the  
100-meter race. He finish the race in 12.6 seconds  
and broke in the school record. The sports meet     
was really success. That was because we were       
all trying to do my best.                       
Although I was not one of the winner, I           
was proud of that we had done.                   
Looking forward to receiving your letter.             
Yours,                                                
Li Ping                                               
1._________           
2._________         
3._________         
4._________      
5._________        
6._________        
7._________        
8._________                                                  
9._________       
10._________     


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