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Journal > Jurnal TANAH TROPIKA (Journal of Tropical Soils) > Ascertainment of K Nutrient Availability Class for Maize by Several Methods

 

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Jurnal TANAH TROPIKA (Journal of Tropical Soils)
##issue.vol## 20, ##issue.no## 1: January 2015
Ascertainment of K Nutrient Availability Class for Maize by Several Methods
Marthen Pasang Sirappa ( Researchers of West Sulawesi Assesment Institute for Agricultural Technology Komplek Perkantoran Gubernur Pemerintah Provinsi Sulawesi Barat)
Peter Tandisau ( Researchers of South Sulawesi Assesment Institute for Agricultural Technology)
Article Info   ABSTRACT
Published date:
29 Jan 2016
 
Research was conducted in Gowa, South Sulawesi at dry land farmer during two years. The aims of the research was to get the best method in ascertainment of availability class of potassium (K) for maize in dry land. The research used a single location approach, which made some of K nutrient artificial. Result of this research indicated that K nutrients class which reached by several methods are: (1) by Cate-Nelson method : two class, ie low and high class, (2) by curve continue method: two until three classes, ie very low to moderate class, low and moderate, and low to high class; and (3) by analysis of variance modified method: three classes, ie low to high class. Ascertainment of K nutrient availability classes by modified analysis of variance method was the best methods compared to other methods. Critical level of K nutrient for maize according to modified analysis of variance method by several extractant is: 0.40 me K 100 g-1 for NH4OAc pH 4.8 extractant; 0.40 to 0.60 me K 100 g-1 for NH4OAc pH 7 extractant; 200-300 ppm K2O for Bray-1 extractant, and 215-250 ppm K2O for Olsen extractant.
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