The effect of Ca, Mg and K fertilization to soil productivity and king grass on acid soil
1997
Purnomo, J. | Wigena, IGP (Pusat Penelitian Tanah dan Agroklimat, Bogor (Indonesia)) | Widodo, S.
Fertilization of Ca, Mg, and K and their effect to soil productivity and king grass was done in 1995/1996 on acid soil in Jambi. Objective of the experiment was to provide the role combination of Ca, Mg dan K fertilizers for king grass. Eight-treatment combination of incomplete factorial of Ca, Mg and K fertilizers was tested and were spread in 16 site location. Those treatments were arranged on randomized block design. The rate of Ca fertilizers equivalent with 0, 1 and 2 times Al extractable. The rate of Mg are 0, 30 and 60 kg Mg/ha and the rate of K was 0, 50 and 100 kg KCl/ha. The source of fertilizers are calcium carbonate for lime, kieserit for Mg and KCl for K. The first harvesting of king grass was done at 3 month after planting and continued by each 40 days for the second and so on. Result of the experiment showed that all of the sites have a low content of Mg and K, with a rate of less than 0.4 me Mg 100/g soil and less than 0.1 me K 100/g soil, respectively. This site with low of Ca (less than 2 me Ca 100/g soil) were spread at 12 site location, while the 4 site were medium status of Ca (2-4 me 100/g soil). Yield of king grass of the first harvesting was higher than the other harvesting. Application of Ca and Mg were not increasing of plant height and yield of king grass by significantly, while application of potassium tends to increase yield of king grass. Critical level of Ca and Mg for King grass are 0,28 me Ca and 0,29 me Mg, while critical level of K was not be found
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