Table 3. Effect of different nutrient sources and weed management practices on nutrient uptake by rice plants at harvest.

Treatment	Nutrient uptake (kg·ha-1) by grain			Nutrient uptake (kg·ha-1) by straw
	N	P	K	N	P	K
Year
Year 1	83.6a	10.8b	19.7a	64.0a	13.3b	100.2a
Year 2	84.8a	11.4a	19.7a	96.5a	14.2a	107.3b
Nutrient management
Fert100	81.0b	11.2a	15.8c	96.8a	14.1ab	111.8a
Fert75-VC25	83.3ab	11.6a	18.3b	98.0a	14.5a	98.1b
Fert75-FYM25	90.1a	11.6a	21.9a	97.5a	13.4ab	10.2a
Fert75-BSM25	89.3a	11.3a	21.7a	91.4a	13.8ab	104.0ab
Fert75-NC25	77.2b	9.7b	20.9a	92.6a	12.9b	96.7b
Weed management
Weedy	73.9c	9.8c	16.9c	90.4b	13.3b	91.9b
Herbicide	86.0b	11.2b	18.2b	95.0ab	13.4b	107.8a
Integrated	92.7a	12.3a	24.0a	100.4a	14.4a	111.5a
Source of variation
Year	ns	*	ns	ns	***	**
NM	***	***	***	ns	**	***
WM	***	***	***	***	**	***
Year × NM	ns	ns	ns	ns	**	ns
Year × WM	ns	*	ns	ns	ns	ns
NM × WM	***	***	***	***	**	***
Year × NM × WM	ns	ns	ns	ns	ns	ns

NM, nutrient management; WM, weed management; N, nitrogen; P, phosphorus; K, potassium; VC, vermicompost; FYM, farmyard manure; BSM, brassicaceous seed meal; NC, neem cake; Fert100, full dose of N,P and K through fertilizer; Fert75-VC25, 75% of N and 100% of P and K through fertilizer with 25% N through VC; Fert75-FYM25, 75% of N and 100% of P and K through fertilizer with 25% N through FYM; Fert75-BSM25, 75% of N and 100% of P and K through fertilizer with 25% N through BSM; Fert75-NC25, 75% of N and 100% of P and K through fertilizer with 25% N through NC; Weedy, no weeding; Herbicide, bispyribac-sodium 25 g/ha at 15 DAT fbmetsulfuron methyl + chlorimuron ethyl (2+2) g/ha at 30 DAT; Integrated, bensulfuron methyl + pretilachlor (60+600) g/ha at 5 DAT fb MW at 30 DAT; DAT, days after transplanting; Within year, nutrient and weed management, numbers followed by different letter indicate significant differences at p ≤0.05 (otherwise statistically at par); ns, non-significant (p> 0.05)

*, ** and *** indicate significant at p< 0.05, 0.01 and 0.001, respectively.