. 2020 Sep 2;11:1307. doi: 10.3389/fpls.2020.01307

Table 5.

Effects of year, cultivar, and levels of NPK on phosphorus accumulation (kg ha^–1) in different plant organs at different growth stages and on phosphorus harvest index of maize.

Treatments	At silking				At physiological maturity					Post-silking P accumulation	HI(P)^†
	Leaf	Stalk		Total	Leaf	Stalk		Grain	Total
	Leaf	Stem	Tassel	Total	Leaf	Stem	Other	Grain	Total
Year
Year 1	7.1a	15.0a	1.4a	23.4a	4.9a	8.1a	2.7a	30.6a	46.3a	23.0a	0.67a
Year 2	7.2a	14.4a	1.5a	23.1a	5.0a	7.0a	2.5a	28.9a	43.4a	20.4b	0.68a
Cultivar
P3522	8.0a	15.9a	0.7c	24.5a	4.8b	5.5b	2.1c	32.6a	45.0a	20.4b	0.74a
P3396	5.7b	13.7b	2.2a	20.8b	5.7a	9.1a	3.4a	28.9b	47.1a	26.3a	0.62b
Rajkumar	7.8a	14.3b	1.4b	24.3a	4.5b	8.1a	2.4b	27.7b	42.6b	18.3b	0.66b
Levels of NPK
N₁₀₀P₃₀K₃₀ (50% RDF)	6.4d	15.1bc	1.4cd	22.9d	5.1cde	6.8cde	2.1d	28.9ef	42.9d	20.0cd	0.67ab
N₁₅₀P₄₅K₄₅ (75% RDF)	7.0cd	15.7bc	1.5bc	24.2cd	5.6bcd	7.7cd	2.6c	33.0cd	48.9c	24.7bc	0.68ab
N₂₀₀P₆₀K₆₀ (100% RDF)	8.3b	16.3b	1.6abc	26.1bc	6.1bc	9.0bc	3.2b	35.5bc	53.7b	27.6b	0.66ab
N₂₅₀P₇₅K₇₅ (125% RDF)	8.9a	16.9b	1.7ab	27.5b	7.5a	16.4a	4.0a	38.8a	66.7a	39.3a	0.59b
N₃₀₀P₉₀K₉₀ (150% RDF)	9.2a	19.4a	1.8a	30.4a	6.5b	11.0b	2.8c	36.9ab	57.3b	26.8b	0.65ab
P₆₀K₆₀ (100% RDF–N)	5.4e	11.7e	1.1e	18.2f	3.2fg	4.2ef	1.9de	20.1g	29.4f	11.2ef	0.69a
N₂₀₀K₆₀ (100% RDF–P)	6.8cd	12.6de	1.3d	20.7e	3.8efg	4.9def	2.6c	26.2f	37.6e	16.8de	0.70a
N₂₀₀P₆₀ (100% RDF–K)	7.4c	14.3cd	1.4cd	23.1d	4.4def	5.9de	2.6c	30.5de	43.3d	20.2cd	0.71a
Control (–NPK)	5.0e	9.7f	1.1e	15.9g	2.7g	2.3f	1.7e	17.6g	24.2g	8.4f	0.73a
Source of variation
Year	ns	ns	ns	ns	ns	ns	ns	ns	ns	*	ns
Cultivar	**	*	**	**	*	*	**	**	*	**	*
Levels of NPK	**	**	**	**	**	**	**	**	**	**	**
Year × cultivar	ns	ns	ns	ns	ns	ns	ns	*	ns	ns	ns
Year × levels of NPK	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Cultivar × levels of NPK	**	ns	ns	**	ns	ns	**	*	ns	*	ns
Year × cultivar × levels of NPK	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns

Year 1 and year 2 represent winter 2012–13 and 2013–14, respectively. Within year, cultivar, and levels of NPK, numbers followed by different letters indicate significant differences at p ≤ 0.05 (otherwise statistically at par). ns, non-significant (p > 0.05). *Significant at p ≤ 0.05. **Significant at p ≤ 0.01; Other = Tassel + cob + shank + husk; ^†HI(P), Harvest Index (Phosphorus)