Indices for optimizing organic, mineral and organic-and-mineral fertilization
2001
Petkova, Z. | Mitovska, R. (Institut po Pochvoznanie "N. Pushkarov", Sofia (Bulgaria))
The differences between N, P and K uptake by maize affect on the ratio of N:P2O5:K2O which is 2:0.3:0,7 according to the summarized data. Under the conditions of our experiment this ratio varied in dependence of fertilizer type. The expense of P for the formation of 100 kg corn is higher in treatments with organic that in those once with mineral frtilization. Therefore manure increases the mobility of P. Similar trend is kept during the next year when the test crop is wheat. The expense of P is higher for the wheat than for the maize. The same trend is valid for the next 2 years of post effect.
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