US EPA

8648689 

Journal Article 

NxP and NxK interactions on grass yield and mineral element composition 

Ragályi, P; Kádár, I 

2008 

Yes 

Cereal Research Communications
ISSN: 0133-3720 

36 

SUPPL. 5 

79-82 

English 

The effect of different N, P and K supply levels (low, satisfactory, high, extreme high) and their combinations were examined in the 31 st year of a long-term fertilization experiment on the development, yield and mineral element content of a 4 years old established all-grass sward in 2004, with seed mixture of eight grass species. The trial was established on a calcareous chernozem soil. The soil of the growing site contained around 3% humus, 3-5% CaCO 3, 20-22% clay in the ploughed layer and was originally moderately well supplied with available K, Mg, Mn, Cu and poorly supplied with P and Zn. The NxP fertilization rose 3-fold the hay yield. The "moderate" supply levels (135 mg kg -1 AL-K 2O and 153 mg kg -1 AL-P 2O 5) basically satisfied the P and K demands of grass. Without a satisfactory P supply the efficiency of N fertilization was much lower and vice versa. As a function of rising NxP supply levels, the Mo content of hay in the 1 st cut dropped from 1.0 to 0.3 mg kg -1, while in the 2 nd cut hay from 4.5 to 0.4 mg kg -1. The Na content of the primary hay increased one order of magnitude with the increasing N-supply, while the K-fertilization reduced it to its 20%. The NxK interactions had negative effect on Na, Ca, Mg and B uptake. 

Element composition; Fertilization; Interaction