Early-late Season Double-cropping Rice Cultivars: Differences of Yield and Nitrogen Uptake in Early and Late Seasons in South China

doi:10.11924/j.issn.1000-6850.casb2023-0308

Abstract

Abstract:

In order to clarify the differences in the yield and nitrogen uptake of early-late season double-cropping rice between early and late seasons in South China, six early-late season double-cropping rice cultivars were planted in early and late seasons according to local high-yield cultivation measures to determine the yield, yield components, dry matter accumulation, nitrogen uptake, etc. The yield of early-late season double-cropping rice were 6.68-7.91 t/hm² and 5.72-6.11 t/hm² planted in early and late season, respectively. The yield in early season was significantly higher than that in late season, with an average increase of 1.53 t/hm². Correlation analysis showed that the higher grain yield in early season was related to the increase in the panicle number and grain weight. There were significant differences in dry matter accumulation and nitrogen uptake between early and late seasons. The dry matter accumulation and nitrogen uptake in early season was increased by 25.0% and 29.5%, respectively, compared to those in late season. In addition, the grain yield of early-late season double-cropping rice were significantly positively correlated with the dry matter accumulation and nitrogen uptake. Early-late season double-cropping rice had higher grain yield, dry matter production and nitrogen uptake capacity when planted in early season. These results provide a theoretical basis for the high-yield cultivation of early-late season double-cropping rice in South China.

Key words: early-late season double-cropping rice, ‘Simiao rice’, yield, dry matter accumulation, nitrogen uptake

ZOU Jixiang, YANG Taotao, WU Longmei, BAO Xiaozhe, ZHANG Bin. Early-late Season Double-cropping Rice Cultivars: Differences of Yield and Nitrogen Uptake in Early and Late Seasons in South China[J]. Chinese Agricultural Science Bulletin, 2024, 40(12): 1-8.

Figures/Tables 7

References 35

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品种	季别	产量/(t/hm²)	有效穗数/(10⁴/hm²)	每穗粒数/(粒/穗)	结实率/%	粒重/mg
美香占2号	早季	6.68a	343.1a	138.0a	85.4a	19.4a
美香占2号	晚季	5.72b	324.6a	135.4a	88.0a	18.5b
象牙香占	早季	7.71a	360.9a	143.7a	87.6a	20.0a
象牙香占	晚季	5.78b	332.8b	139.4a	86.2a	18.1b
19香	早季	7.06a	303.5a	191.3b	70.8a	21.8a
19香	晚季	5.84b	240.9b	204.3a	71.9a	20.6b
南晶香占	早季	7.66a	316.3a	146.0a	80.4b	22.9a
南晶香占	晚季	5.96b	253.1b	141.5a	86.2a	22.2b
二广香占3号	早季	7.91a	281.9a	153.3a	89.7a	22.4a
二广香占3号	晚季	6.06b	239.6b	153.9a	90.6a	21.6b
莉香占	早季	7.65a	284.4a	174.7a	83.3a	21.1a
莉香占	晚季	6.11b	255.2b	156.4b	85.3a	20.3b
方差分析	品种	6.0^**	38.9^**	62.0^**	59.4^**	91.2^**
	季别	239.7^**	73.6^**	1.3	7.3^*	67.7^**
	品种×季别	2.4	2.0	3.0^*	1.9	1.9

品种	季别	产量/(t/hm²)	有效穗数/(10⁴/hm²)	每穗粒数/(粒/穗)	结实率/%	粒重/mg
美香占2号	早季	6.68a	343.1a	138.0a	85.4a	19.4a
美香占2号	晚季	5.72b	324.6a	135.4a	88.0a	18.5b
象牙香占	早季	7.71a	360.9a	143.7a	87.6a	20.0a
象牙香占	晚季	5.78b	332.8b	139.4a	86.2a	18.1b
19香	早季	7.06a	303.5a	191.3b	70.8a	21.8a
19香	晚季	5.84b	240.9b	204.3a	71.9a	20.6b
南晶香占	早季	7.66a	316.3a	146.0a	80.4b	22.9a
南晶香占	晚季	5.96b	253.1b	141.5a	86.2a	22.2b
二广香占3号	早季	7.91a	281.9a	153.3a	89.7a	22.4a
二广香占3号	晚季	6.06b	239.6b	153.9a	90.6a	21.6b
莉香占	早季	7.65a	284.4a	174.7a	83.3a	21.1a
莉香占	晚季	6.11b	255.2b	156.4b	85.3a	20.3b
方差分析	品种	6.0^**	38.9^**	62.0^**	59.4^**	91.2^**
	季别	239.7^**	73.6^**	1.3	7.3^*	67.7^**
	品种×季别	2.4	2.0	3.0^*	1.9	1.9

季别	品种	移栽（月/日）	抽穗（月/日）	移栽-抽穗/d	成熟（月/日）	抽穗-成熟/d
早季	美香占2号	4/1	6/4	64	7/6	32
	象牙香占	4/1	6/1	61	7/3	32
	19香	4/1	6/7	67	7/8	31
	南晶香占	4/1	5/31	60	7/1	31
	二广香占3号	4/1	5/31	60	7/1	31
	莉香占	4/1	6/4	64	7/6	32
晚季	美香占2号	7/29	9/24	57	10/26	32
	象牙香占	7/29	9/24	57	10/27	33
	19香	7/29	9/24	57	10/26	32
	南晶香占	7/29	9/22	55	10/24	32
	二广香占3号	7/29	9/22	55	10/25	33
	莉香占	7/29	9/24	57	10/26	32

季别	品种	移栽（月/日）	抽穗（月/日）	移栽-抽穗/d	成熟（月/日）	抽穗-成熟/d
早季	美香占2号	4/1	6/4	64	7/6	32
	象牙香占	4/1	6/1	61	7/3	32
	19香	4/1	6/7	67	7/8	31
	南晶香占	4/1	5/31	60	7/1	31
	二广香占3号	4/1	5/31	60	7/1	31
	莉香占	4/1	6/4	64	7/6	32
晚季	美香占2号	7/29	9/24	57	10/26	32
	象牙香占	7/29	9/24	57	10/27	33
	19香	7/29	9/24	57	10/26	32
	南晶香占	7/29	9/22	55	10/24	32
	二广香占3号	7/29	9/22	55	10/25	33
	莉香占	7/29	9/24	57	10/26	32

品种	季别	干物质积累量/(t/hm²)			收获指数/%
品种	季别	分蘖盛期	抽穗期	成熟期	收获指数/%
美香占2号	早季	4.21a	10.09a	12.96a	44.6a
美香占2号	晚季	2.84b	9.41a	10.85b	45.6a
象牙香占	早季	3.94a	10.01a	14.56a	45.8a
象牙香占	晚季	2.75b	9.08b	11.40b	43.9b
19香	早季	3.77a	10.3a	13.58a	45.0a
19香	晚季	3.50a	9.57b	11.20b	45.2a
南晶香占	早季	4.16a	9.67a	14.74a	45.0a
南晶香占	晚季	3.02b	7.97b	11.67b	44.2a
二广香占3号	早季	3.76a	10.06a	15.04a	45.5a
二广香占3号	晚季	3.50a	8.41b	11.90b	44.1a
莉香占	早季	4.18a	9.61a	14.88a	44.5a
莉香占	晚季	3.92a	9.68a	11.55b	45.8a
方差分析	品种	6.6^**	4.9^**	13.7^**	0.0
	季别	100.8^**	39.9^**	477.2^**	0.2
	品种×季别	8.5^**	3.3^*	2.4	0.5