基于产量和养分含量的旱地小麦施磷量和土壤有效磷优化

doi:10.3864/j.issn.0578-1752.2019.01.008

Abstract

Abstract:

【Objective】It is of great importance to explore the wheat grain yield, soil available phosphorus (P) and grain nutrient contents under a long term P application at different rates, for the purpose of appropriate P application, wheat yield increase and improvement of nutritional quality in drylands.【Method】Field experiments were conducted to investigate the effects of different phosphorus (P) rates on wheat yield, biomass, yield components, grain nitrogen (N)-, P- and potassium (K)-contents, soil available P content, and P absorption and utilization, based on the long-term fixed field experiment which was initiated in 2004 in the Loess Plateau. Soil and plant samples were collected in the consecutive experimental years of 2014-2015, 2015-2016 and 2016-2017. 【Result】 The three-year averaged results showed that long-term application of P increased wheat yield, biomass, spike number and grains per spike by 67%, 58%, 64% and 8%, respectively, while 1000-grain weight was decreased by 7% compared with no P application. The wheat yield and biomass were quadratically correlated with the P rate, and the maximum wheat yield was 6 465 kg·hm ^-2 at P rate of 144 kg P₂O₅·hm ^-2. The P and K content of grain increased with the P rate increasing, while the N content showed an opposite trend. There was a significant positive correlation between the soil available P content and the P rate. The soil available P was 16.9 mg·kg ^-1at sowing and 20.4 mg·kg ^-1at harvest when the maximum yield was occurred. The P absorption and utilization efficiency decreased with the increased of P rate. For each 50 kg P₂O₅·hm ^-2 increment, the P requirement increased by 0.4 g·kg ^-1 for the grain yield formation, while the P harvest index and the P physiological efficiency decreased by 1.3% and 45.1 kg·kg ^-1, respectively. 【Conclusion】 By balancing the wheat grain yield and key nutrient contents, the target grain yield should be 95% of the maximum yield in drylands of the experimental area, and the corresponding P application rate should be kept at 94 kg P₂O₅·hm ^-2, the available P at 12.0 and 13.8 mg·kg ^-1 at sowing and harvest, respectively.

Key words: dryland, winter wheat, phosphorus application, available phosphorus, yield components, nutrient concentration, Loess Plateau

MA QingXia,WANG ZhaoHui,HUI XiaoLi,ZHANG Xiang,ZHANG YueYue,HOU SaiBin,HUANG Ning,LUO LaiChao,ZHANG ShiJun,DANG HaiYan. Optimization of Phosphorus Rate and Soil Available Phosphorus Based on Grain Yield and Nutrient Contents in Dryland Wheat Production[J].Scientia Agricultura Sinica, 2019, 52(1): 73-85.

Figures/Tables 8

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Table 1

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处理 Treatment	pH	有机质 Organic matter (g·kg^-1)	全氮 Total N (g·kg^-1)	速效磷 Olsen-P (mg·kg^-1)	速效钾 NH₄OAc-K (mg·kg^-1)	矿质氮 Inorganic N (mg·kg^-1)
处理 Treatment	pH	有机质 Organic matter (g·kg^-1)	全氮 Total N (g·kg^-1)	速效磷 Olsen-P (mg·kg^-1)	速效钾 NH₄OAc-K (mg·kg^-1)	NO₃^--N	NH₄⁺-N
2004	8.3	13.8	1.1	15	182.4	5.4	2.4
CK	8.2	14.7	0.9	5	137.4	2.5	0.4
P0	8.2	13.5	0.9	5	127.7	6.2	0.3
P50	8.2	14.4	0.9	8	130.4	5.1	0.7
P100	8.2	15.2	1.0	13	132.8	6.4	0.7
P150	8.1	15.1	1.0	32	127.7	6.5	0.6
P200	8.2	15.0	0.9	36	131.7	7.7	0.7

年份 Year	磷用量 P₂O₅ rates (kg·hm^-2)	穗数 Spike number (×10⁴·hm^-2)	穗粒数 Kernels per spike	千粒重 1000-grain mass (g)
2015	0	416d	30b	39.8a
	50	565c	32ab	37.0b
	100	622b	35a	32.6c
	150	709a	32ab	32.0c
	200	684a	32ab	31.9c
2016	0	216c	33b	40.0a
	50	370b	34ab	40.4a
	100	393ab	37a	40.4a
	150	429ab	35ab	39.0a
	200	436a	36ab	39.0a
2017	0	307c	31b	35.6ab
	50	411b	35a	36.6a
	100	528a	31b	36.0ab
	150	497a	32ab	33.8b
	200	532a	32ab	33.6b
年度均值Annual average
2015		599A	35A	39.8A
2016		455B	32A	35.1B
2017		369C	32A	34.6B
处理均值 Treatment average	0	313c	31b	38.5a
	50	449b	34a	38.0ab
	100	514a	34a	36.3bc
	150	545a	33ab	34.9c
	200	551a	33ab	34.8c
变异来源 Source of variance（F值）
年度 Year (Y)		31.1**	3.7	36.6**
处理 Treatment (T)		41.4**	1.7	8.0**
年度×处理Y×T		1.1	1.2	3.0*

年份 Year	磷用量 P₂O₅ rate (kg·hm^-2)	吸磷量 P uptake (kg·hm^-2)	磷收获指数 P harvest index (%)	磷生理效率 P physiological efficiencies (kg·kg^-1)	需磷量 1000 kg P requirement (g·kg^-1)	磷肥偏生产力 P partial factor productivity (kg·kg^-1)
2015	0	11.3d	87.0a	449.3a	2.2d	-
	50	18.0c	82.1b	371.3b	2.7c	133.9a
	100	24.2b	80.3bc	293.1c	3.5b	69.2b
	150	25.1ab	78.8c	288.9c	3.5b	48.4c
	200	26.9a	75.1d	264.4d	3.8a	35.3d
2016	0	5.8c	91.8a	502.3a	2.0b	-
	50	10.3b	91.0a	490.3a	2.0b	101.1a
	100	15.5a	91.6a	377.8b	2.7a	58.4b
	150	15.7a	90.3a	375.1b	2.7a	39.3c
	200	17.3a	89.4a	350.7c	2.9a	30.4d
2017	0	7.1c	86.3ab	441.0a	2.3d	-
	50	13.5b	88.2a	390.2b	2.6c	105.2a
	100	19.6a	85.8ab	299.5c	3.4b	58.5b
	150	19.9a	84.8b	267.9d	3.8a	35.1c
	200	21.8a	84.4b	260.8d	3.9a	28.2d
年度均值 Year average
2015		21.1A	80.7C	333.4B	3.1A	71.7A
2016		12.9B	90.8A	419.3B	2.4B	57.2B
2017		16.4B	86.0B	331.9A	3.2A	56.7B
处理均值 Treatment average	0	8.0a	88.4a	464.2a	2.2d	-
	50	14.0b	87.1ab	417.3b	2.4c	113.4a
	100	19.8c	85.9bc	323.5c	3.2b	62.0b
	150	20.2c	84.6c	310.6cd	3.3b	40.9c
	200	22.0d	83.0d	291.9d	3.5a	31.3d
变异来源（F值） Source of variance
年度 Year (Y)		24.2**	33.9**	35.1**	22.1**	72.9**
处理 Treatment (T)		87.5**	7.7**	103.2**	75.3**	582.9**
年度×处理Y×T		0.7	2.7*	1.1	2.7*	6.3**

Optimization of Phosphorus Rate and Soil Available Phosphorus Based on Grain Yield and Nutrient Contents in Dryland Wheat Production

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