Coffee tree fertilization with potassium nitrate via leaf and soil, in autumn-winter and spring-summer: effects on nitrate reductase activity, on plant growth and production

被引：5

作者：

de Freitas, Rupert Barros ^{[1
]}

Alves, Jose Donizeti ^{[2
]}

Magalhaes, Marcelo Murad ^{[2
]}

Pereira Goulart, Patricia de Fatima ^{[3
]}

do Nascimento, Marilza Neves ^{[2
]}

Fries, Daniela Deitos ^{[2
]}

机构：

[1] Fundacao Comunitaria Ensino Super Itabira, BR-35900972 Itabira, MG, Brazil

[2] Univ Fed Lavras UFLA, Dept Biol DBI, BR-37200000 Lavras, MG, Brazil

[3] Ctr Univ Lavras Unilavras, BR-37200000 Lavras, MG, Brazil

来源：

CIENCIA E AGROTECNOLOGIA | 2007年 / 31卷 / 04期

关键词：

coffee; potassium nitrate fertilization; nitrate reductase; growth; yield; Coffea arabica;

D O I：

10.1590/S1413-70542007000400001

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

The objective of this work was to verify the effect of the fertilization of 100g N/year/plant, in three periods (autumn-winter, spring-summer and autumn-winter/spring-summer) and three types of application (leaf, soil and leaf/soil) on the development, production and nitrate reductase activity (NR) on four years old Rubi-MG cultivar. The analysis of type and time of application showed no alteration on NR activity being higher on roots in cold weather and higher on leaves in warmer weather. The same was observed with growth pattern, fast in hot/rain season and slow in dry/cold period. During autumn-winter, applications may be performed on leaf or leaf-soil. These types of fertilization were the most efficient during growth recovering. When the fertilization occurred in both periods, any type may be used. Although, several pulverizations are nonviable, one or more pulverization with KNO3 can efficiently replace soil fertilization.

引用

页码：945 / 952

页数：8

共 14 条

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