Table 8.

Influence of crop establishment techniques and nutrient management options on soil potassium (kg K ha⁻¹) (NH₄OAC-extractable) after completion of first and second cycle of rice–wheat cropping system.

Treatment	Control	RDN	RDN* + Zn**	75% RDN	75% RDN + Zn	75% RDN + MC1	75% RDN + MC1 + Zn	75% RDN + MC2	75% RDN + MC2 + Zn	Mean
2013–2014
PTR-CDW	259.9	181.6	169.9	215.0	207.8	188.3	175.9	185.8	172.3	195.2
SRI-SWI	256.5	182.4	174.7	214.5	207.2	189.4	176.1	186.5	173.9	195.7
ARS-ZTW	250.5	165.8	152.9	197.0	190.2	172.1	159.1	169.8	154.5	179.1
Mean	255.6	176.6	165.8	208.8	201.7	183.3	170.4	180.7	166.9

	Crop establishment techniques	Nutrient management options	Interaction
SEm±	0.45	2.59	4.49
CD (p = 0.05)	1.76	7.37	12.76

2014–2015
PTR-CDW	231.3	146.9	113.1	233.0	217.1	164.2	126.4	156.3	120.2	167.6
SRI-SWI	219.7	151.0	122.2	232.8	217.0	168.5	128.6	159.9	125.1	169.4
ARS-ZTW	205.0	118.0	81.3	197.4	181.6	134.7	95.7	127.3	86.5	136.4
Mean	218.7	138.6	105.5	221.1	205.2	155.8	116.9	147.8	110.6

	Crop establishment techniques	Nutrient management options	Interaction
SEm±	1.10	6.06	10.5
CD (p = 0.05)	4.32	17.24	29.87

PTR, puddled transplanted rice; SRI, system of rice intensification; ARS, aerobic rice system; CDW, conventional drill-sown wheat; SWI, system of wheat intensification; ZTW, zero tillage wheat; RDN*, recommended dose of nutrients [120 kg nitrogen ha⁻¹ and 25.8 kg phosphorus (P) ha⁻¹ per crop]; Zn**, 5 kg Zn ha⁻¹ through ZnSO₄.7H₂O per crop; MC1, Anabaena sp. (CR1) + Providencia sp. (PR3) consortium; MC2, Anabaena–Pseudomonas biofilm; Potassium (K) was applied uniformly in all treatments @ 49.8 kg K ha⁻¹ per crop; Interaction, significant in both cropping cycle.