An experiment was undertaken to examine the effect of banding P and N with K fer

Question

An experiment was undertaken to examine the effect of banding P and N with K fertilizer on the growth and K fertilizer recovery of wheat and chickpea in a K responsive soil. The estimate of K fertilizer recovery was undertaken using a Rb tracer and the effect on N fixation was measured by the 15N natural abundance method. The results for K recovery and 15N (‰) are presented in Table 1.

Table 1. Effect of co-locating P and N fertilizer in a band of K (100 kg K/ha) on fertilizer K recovery measured using a Rb tracer (20% of the total K applied replaced with Rb) of wheat and chickpea grown at two row spacings (25cm and 50cm) in a low K soil.

Write brief comments in response to the following 3 questions

1) What effect does co-location of P/N with K have on K fertilizer recovery in both species? (5%) (<400 words)

2) How does row spacing affect K fertilizer recovery in each species? Why? (5%) (<400 words)

3) Does the addition of N reduce the reliance of chickpea (B value = -1.7‰) on N fixation? (10%) (<700 words)

Explanation / Answer

1) The experiment was conducted to determine the effect of banding P and N with K fertliser on K recovery of wheat and chickpea in a K responsive soil. The estimate of K fertliser recovery was undertaken using a Rb tracer. The results described in the table show that the co-location of P/N increases the K fertiliser recovery in both the species (wheat and chickpea).

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