不同磷敏感棉花品种临界磷浓度稀释模型与磷营养诊断

doi:10.3864/j.issn.0578-1752.2020.22.004

Abstract

Abstract:

【Objective】In order to provide a theoretical basis for optimum application of phosphorus fertilizer in cotton, the critical phosphorus concentration (CPC) dilution curve of two cotton cultivars with different phosphorus sensitivity and calculated phosphorus nutrition index (PNI) were established and compared. 【Method】In 2017 and 2018, the field experiments with five phosphorus (P) levels (0, 50, 100, 150, and 200 kg P₂O₅·hm ^-2) were conducted by `using two cotton cultivars with different phosphorus sensitivity, Lu 54 and Yuzaomian 9110, at Dafeng, Jiangsu province.【Result】Phosphorus application had no significant effect on cotton boll weight, but the application of 150 and 200 kg P₂O₅·hm ^-2 significantly increased cotton boll number and seedcotton yield. With phosphorus application increasing, cotton boll number and seedcotton yield of phosphorus sensitive cotton variety (Lu 54) were increased by 16.0%-37.9% and 16.6%-44.9%, respectively, which was higher than the increase of Yuzaomian 9110. Cotton biomass increased while phosphorus concentration decreased as cotton plant growing under all P treatments. At the same sampling day, cotton shoot biomass and phosphorus concentration raised with the phosphorus application increasing and peaked at 150 and 200 kg P₂O₅·hm ^-2. Based on the relationship between the shoot biomass and phosphorus concentration in 2017, the critical phosphorus dilution curve models for the two varieties were established (Lu 54: P_c=0.784W ^-0.221; Yuzaomian 9110: P_c=0.774W ^-0.198). The RMSE of the two dilution curve models were 0.1296 and 0.1383, and the n-RMSE were 17.8504% and 18.5447%, respectively, indicating that the model was stability, and the stability of Lu 54 was slightly higher than that of Yuzaomian 9110. Compared with the model parameters of Yuzaomian 9110, parameter a and b of Lu 54 was increased by 1.29% and 11.62%, respectively. PNI increased and then decreased with the growth process, and augmented with the increase of phosphorus application at the same sampling day. PNI was also positively correlated with relative aboveground biomass. 【Conclusion】 Phosphorus application had no significant effects on cotton boll weight, but significantly increased boll number, and consequently increased seedcotton yield. Phosphorus-sensitive variety Lu 54 had a faster decline in phosphorus concentration per unit of dry matter accumulation than Yuzaomian 9110. CPC and PNI of two cotton varieties could diagnose and evaluate the phosphorus nutrition status of cotton plants. According to the results of seedcotton yield and PNI, the application of 150 kg·hm ^-2 phosphorus fertilizer was suitable for cotton in this region.

Key words: cotton, phosphorus rates, phosphorus concentration, critical phosphorus dilution curve, phosphorus nutrition index

PANG BaoGang,CAO Nan,ZHOU ZhiGuo,ZHAO WenQing. Critical Phosphorus Concentration Dilution Model and Phosphorus Nutrition Diagnosis in Two Cotton Cultivars with Different Phosphorus Sensitivity[J].Scientia Agricultura Sinica, 2020, 53(22): 4561-6130.

Figures/Tables 8

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References 35

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品种 Variety	施磷量 Phosphorus application rate (kg P₂O₅·hm^-2)	2017			2018
品种 Variety	施磷量 Phosphorus application rate (kg P₂O₅·hm^-2)	铃数 Boll number (×10⁴·hm^-2)	铃重 Seedcotton weight per boll (g)	籽棉产量 Seedcotton yield (kg·hm^-2)	铃数 Boll number (×10⁴·hm^-2)	铃重 Seedcotton weight per boll (g)	籽棉产量 Seedcotton yield (kg·hm^-2)
豫早棉9110 Yuzaomian 9110	0	87.1±1.0b	4.0±0.0a	3459.5±33.6c	92.6±0.9d	4.2±0.1a	3869.3±55.4d
	50	93.5±1.0b	4.0±0.0a	3760.8±47.2b	98.4±1.3c	4.2±0.2a	4124.9±65.9c
	100	110.6±7.2a	4.0±0.1a	4459.0±79.8a	109.6±0.9b	4.3±0.0a	4681.6±58.6b
	150	115.2±4.0a	4.0±0.1a	4643.1±71.9a	113.9±2.8a	4.3±0.0a	4897.2±87.4a
	200	115.5±1.6a	4.1±0.1a	4691.7±53.7a	116.3±3.3a	4.3±0.0a	4991.9±93.5a
鲁54 Lu 54	0	90.0±2.1d	3.7±0.1a	3366.1±59.9d	91.4±1.5d	3.9±0.1a	3538.1±49.5d
	50	104.6±3.8c	3.8±0.1a	3924.9±75.6c	108.9±2.2c	3.9±0.2a	4257.7±58.5c
	100	115.5±4.0b	3.8±0.0a	4342.0±70.0b	120.3±2.9b	4.0±0.1a	4762.3±79.1b
	150	122.7±1.1a	3.8±0.0a	4686.3±84.4a	127.4±1.9a	4.0±0.0a	5107.6±72.4a
	200	123.5±2.5a	3.8±0.1a	4705.7±47.9a	126.0±1.6a	4.0±0.0a	5127.9±81.2a
方差分析ANOVA
品种Variety (V)		**	**	NS	**	**	NS
施磷量P rate		**	NS	**	**	NS	**
品种×施磷量V×P rate		**	NS	**	**	NS	**

品种 Variety		磷稀释模型 Phosphorus dilution model
品种 Variety		a	b	R²
鲁54 Lu 54	P_min	0.599	0.139	0.945**
	P_max	0.798	0.217	0.852*
	P_c	0.784	0.221	0.858*
豫早棉9110	P_min	0.584	0.320	0.978**
Yuzaomian 9110	P_max	0.782	0.201	0.838*
	P_c	0.774	0.198	0.845*

生育期 Stage	鲁54 Lu 54			豫早棉9110 Yuzaomian 9110
	测定值 Observed value	模拟值 Simulated value	误差 Error	测定值 Observed value	模拟值 Simulated value	误差 Error
	苗期 Seedling stage	1.3500	1.4292	0.0560	1.2800	1.3045	0.0173
盛蕾期Peak squaring stage	0.9200	0.7979	0.0863	0.9300	0.7658	0.1161
盛花期Peak flowering stage	0.5800	0.5262	0.0381	0.6265	0.5833	0.0305
盛铃期Peak boll setting stage	0.4000	0.4363	0.0257	0.4734	0.4853	0.0084
吐絮期Boll opening stage	0.3800	0.4167	0.0259	0.4181	0.4473	0.0207
RMSE	0.1296			0.1383
n-RMSE	17.8504%			18.5447%

Critical Phosphorus Concentration Dilution Model and Phosphorus Nutrition Diagnosis in Two Cotton Cultivars with Different Phosphorus Sensitivity

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