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Fertilizer application is an important material basis to ensure crop growth, and special formula fertilizer for rapeseed is widely used in production as a key technology for light and simplified planting of rapeseed. The appropriate dosage of special formula fertilizer for rapeseed that clearly takes into account the dual objectives of abundant yield and high quality will provide key technical support for green and high-quality production of rape-seed. Five fertilizer dosages of 0, 450, 600, 750 and 900 kg/hm2 were set through field trials at three locations in Jiangling County, Shayang County and Honghu City, Hubei Province, in 2020-2021 to study the effects of different dedicated formula fertilizer dosages on rape yield, yield composition factors, nutrient content and quality. Application of the dedicated formula fertilizer significantly increased the number of corners per plant, the number of grains per corner and the thousand grain weight, which in turn enhanced the yield of rapeseed. Compared with the no-fertilizer treatment, the number of corms per plant, number of grains per corner and thousand grain weight increased by 277.4%, 17.9% and 9.2%, respectively, and the yield of rapeseed increased by 183%-300% when the special formula fertilizer was applied at a rate of 900 kg/hm ². The application of canola-specific formula fertilizer significantly affected the oil and protein content of rapeseed. Compared with the no-fertilizer treatment, the protein content of rapeseed was highest at the special formula fertilizer dosage of 900 kg/hm2, with a growth rate of 16.0%-34.6%; the oil content was lowest at the fertilizer dosage of 900 kg/hm2, with a decrease of 4.4%-11.6% compared to the no-fertilizer treatment. Correlation analysis showed that the increase of special fertilizer significantly increased rapeseed yield, water content, protein, erucic acid and fatty acid composition, and reduced glucosinolate content in rapeseed. Taking into account the yield, rapeseed quality and feed, a special fertilizer dosage of 750-900 kg/hm2 could achieve higher rapeseed yield and protein yield with less increase in the production of glucosinolate, erucic acid and saturated fatty acid in rapeseed and Increased oil production. Continue to pursue quality improvement on the basis of yield increase of rape. Medium and trace elements can be added appropriately in combination with different soil fertility conditions to further improve the oil content of rapeseed and the composition of fatty acids, so as to achieve the synergy between yield and quality. [ABSTRACT FROM AUTHOR]

To investigate the nutrient limiting factors for a practical fertilization proposal on direct - sowing oilseed rape in Guizhou Province, fertilization field experiments were conducted using cultivar Youyan 599 (Brassica napus L.) in main rapeseed planting area of Guizhou during 2011 - 2012. Results showed that compared to no fertilization treatment (CK), seed yield of direct - sowing oilseed rape significantly increased when fertilizers were applied. Among them, NPKB treatment had the best performance with the average yield of 2189kg/hm². While compared to NPKB treatment, yield outputs decreased to 961, 342, 295 and 184kg/hm² in PKB (without N), NKB (without P), NPB (without K), and NPK (without B) treatments, respectively. It indicated that the nutrient limiting factors were ranked as N > P > K > B. Compared to farmers' fertilization practices (FFP ) treatment, NPKB treatment increased the application rate, but the production was improved significantly by 430kg/hm². Nutrient accumulation and fertilizer use efficiency were also significantly improved. Nitrogen, phosphorus and potassium nutrient accumulation (corresponding fertilizer use efficiency) increased 28.6 kg/hm² (13.5%), 9.6 kg/hm² (3.3%), 71.4 kg/hm² (23.9%) compared to FFP . As for economic profits, the revenue of NPKB treatment was increased by 1 109 yuan/hm2 compared to FFP. It suggested that the yield, nutrients accumulation and profits could be significantly improved by a combination of balanced fertilization. [ABSTRACT FROM AUTHOR]

A field trial was conducted in Dangyang City to compare the yield and nitrogen (N) use efficiency of 2 japonica rice varieties ( Zhongdao 1 and Huaidao 5) in the hilly land of central Hubei Province ( single-cropping indica rice area) under different N levels. The results showed that the grain yield of the treatments with N were increased averagely by 2 179 kg/hm² and 3 209 kg/hm², and the increase rates were 45.6% and 53.5%, respectively. Linear and platform correlations had been shown between yield and N fertilizer amount. The platform yields of "Zhongdao 1" and "Huaidao 5" were 7 517 kg/hm² and 10 234 kg/hm², respectively. The most suitable N application amount were 221.0 kg/hm² and 235.5 kg/hm², respectively. Compared with N0 treatment, the N uptakes by these 2 japonica rice varieties were averagely increased 58.7 kg/hm² and 71.8 kg/hm², and the increase rates were 80.9% and 85.2%. When the N application amount was 248 kg/hm², the N recovery efficiency (NRE), N agronomic efficiency (NAE), N contribution rate (NCR) and partial factor productivity of applied N (PFPN) of the 2 varieties were 29.4% and 37.6%, 10.6 kg/kg and 18.0 kg/kg, 35.4% and 42.6%, 29.8 kg/kg and 42.3 kg/kg. The result of comprehensive analysis believed that " Huaidao 5" could get a higher yield and high N use efficiency when planted in the hilly land of central Hubei Province. [ABSTRACT FROM AUTHOR]

For sustainable land use and higher revenue on both green manure and oil seed rape (Brasswa napus L. ) , a practical rape/Chinese milk vetch (Astragalus sinicus L. ) intercropping system was to be established without affecting yields of rapeseed. Effects of the intercropping (planting two lines of rape with one line of Chinese milk vetch within one meter width) under different planting densities (from 200 000 to 400 000 plants per hectare) of rapeseed were investigated on rape growth and yield in field. Results showed that the accumulation of nitrogen, phosphorus , potassium and carbon in rape were close to mono - cropping rape (MR , at the density of 300 000 plants per hectare) or higher. The plant height , root length , root crown diameter , weight per plant , and yield were similar to MR or significantly higher. About 3 592 to 5 724 kg per hectare of green manures were harvested when rape yield maintained at the MR level. Thus , the system showed clear advantage of land resources with LER (land equivalent ratio) more than 1. [ABSTRACT FROM AUTHOR]

Field trials in two sites were conducted to study the effect of special fertilizer for rapeseed on the growth, yield, nutrient uptake and nutrient recovery efficiency. Results showed that application of multi - nutrient and long - effect special fertilizer for rapeseed promoted growth significantly. Plant height, stem diameter, SPAD value, branch number and dry weight of individual plant increased by 30. 1%, 72.7%, 162.2%, 31.0% and 130. 1% respectively, compared to that of no fertilizer control. Significant linear and platform correlations had been shown between yield and fertilizer quantity. Proper fertilizer increased yield significantly, for it promoted branch number and - number. Results also showed that dry matter and N, P2O5 and K2O uptake by rapeseed were all improved significantly after using the special fertilizer, although the nutrient recovery efficiency decreased gradually when fertilizer quantity increased. The average N, P2O5 and K2O recovery efficiency on two experimental sites were 37.0%, 33.5% and 75.6% respectively when fertilizer quantity was 1 125kg/hm2. It could be calculated that the appropriate quantity of multi - nutrient and long - effect special fertilizer for rapeseed was 1 200 to 1 275 kg/hm2 to target yield of 2 700 to 3 000kg/hm2. [ABSTRACT FROM AUTHOR]

Field experiments were carried out to study the effects of nitrogen ( N ) application rate on rapeseed yield and N fertilizer use efficiency in Hubei Province during 2007 to 2008. Compared to no N application, the yield of N treatments ( as 75, 150 and 225kg/hm²) increased 41.9%, 70.3% and 66.2% respectively. N content increased 9.1%, 14.2% and 13.1%, and total N absorbed by above ground parts increased 59.6%, 111.6% and 108.0% respectively. The results demonstrated that N application significant promoted growth, yield and N accumulation. With increased N application rate, N requirement for 100kg -seeds was increased, while N agronomic use efficiency (AUE), partial factor productivity (PFP) and apparent recovery efficiency (ARE) of rapeseed decreased significantly. Based on rapeseed yield and N use efficiency, the optimum N fertilizer application rate was 150kg/hm² in Hubei Province. [ABSTRACT FROM AUTHOR]

Variation of soil fertility and effect of fertilizers including nitrogen(N), phosphorus(P), potassium(K) and boron(B) on rapeseed were analyzed in winter rapeseed-growing region of China. The data came from three investigations in 1961-1965, 1981-1985 and 2004-2006. Results showed that soil organic matter(OM), total N(TN), alkali-hydrolyzable nitrogen(AHN), available phosphorus(AP) and available boron(AB) in major areas were increased significantly in 2004-2006. The content of soil OM, AP and AB increased slightly too. But the deficiency of available soil nutrients was enlarged because of improvement of soil critical nutrient values. Results of field experiments during 2004 to 2006 indicated that increment of rape seed yield from fertilization was much higher than the other two periods. The contributions of fertilizers to yield were increased from 23.8% between 1961- 1965 and 54.5% between 1981-1985 to 55.1% between 2004-2006. It was concluded that soil fertility was enhanced steadily in winter rape seedegion, but the deficient area of available-nutrients was increased. High yield rape seed was based on integrated nutrient managements of N,P,K,B,etc. [ABSTRACT FROM AUTHOR]

Field experiments were carried out to study the effects of phosphorus (P) application rate on rapeseed yield and P fertilizer use efficiency in Hubei Province during 2007 -2008. Compared to the control with zero P application, the yield of P2O5 treatments (as 37. 5, 75. 0 and 112. 5kg/hm2, respectively) increased 24. 2% 42.9% and 43. 2% ,as well as the P content increased 10. 5%, 16. 7% and 27.1%, and total P absorbed by aboveground parts increased 36. 1% , 59.1% and 78.7% , respectively. The results indicated significant promotion of P application to growth, yield and P accumulation. With the increase of P application rate, the P required for 100kg seeds was increased, while the P agronomic use efficiency (AUE) , partial factor productivity (PFP) , apparent recovery efficiency (ARE) and physiological use efficiency (PUE) of rapeseed were decreased significantly. 75.0kg/hm2 of P fertilizer was the optimum to both yield and P use efficiency. [ABSTRACT FROM AUTHOR]

Abstract: To investigate the effect of nitrogen (N), phosphorus (P), potassium (K), and boron (B) on rapeseed (Brassica napus L.) yield and profit and to provide guidance of fertilization in rapeseed production in Yangtze River Basin, 32 field experiments at different sites were carried out in 10 major rapeseed production provinces in 2006–2007 growing season. There were 6 treatments in each experiment, i.e., combination application of N, P, K, and B fertilizers (NPKB), the absence of each one fertilizer (PKB, NKB, NPB, and NPK), and the fertilization practice of farmers (FFP, control). The average yield of NPKB treatment was 2590 kg ha−1. Compared with PKB, NKB, NPB, NPK, and FFP treatments, the yield of NPKB was higher by 1055, 727, 253, 337, and 639 kg ha−1, respectively. The effects of N, P, K, and B on yield ranked as N > P > K ≈ B. The seed yield increment reduced in treatments of P, K, and B application when there were more available P, K, and B in soil. The average profit of NPKB treatment was 7274 RMB Yuan per hectare according to the fertilizer and rapeseed prices in 2006 and 2007, which were higher than PKB, NKB, NPB, and NPK treatments by 2868, 2139, 434, and 1076 RMB Yuan per hectare. The effects of N, P, K, and B fertilizer on yield and profit of rapeseed were not identical in all experiments. Based on current facts in agricultural production in China, significant profit was regarded as value to cost ratio (VCR) above 2.0. Among the 32 experiments, 87.5%, 87.5%, and 50.0% showed significant profit from inputs of N, P, and K fertilizers, respectively. Thus, the combination of N, P, K, and B fertilizers significantly increased both rapeseed yield and profits. [Copyright &y& Elsevier]