Abstract
Based on a comprehensive analysis of population growth and grain demand,the development trends of irrigated agriculture,rain-fed agriculture as well as grain and the planting of economic crops are analyzed.With the grain self-sufficient rate of 95%,above 100,000,000 hm2 sown area every year,above 500,000,000 t grain,and trading volume less than 5% in the international market,the balance of supply and demand will be maintained.Moreover,the change and development of maize production techniques are analyzed from the perspectives of main measures,technical characteristics and mechanisms for per unit area yield increase in the past 5 decades and more in China in this paper.The results show that maize yield per unit area in China increased by 4 205.1 kg or 437.3% from 1949 to 2007,with annual growth rate of 85.84 kg/hm2,and the total yield increased from 12.418 million tons to 152.30 million tons,an increase of 12.3 times,of which 68.4% was contributed by yield increase per unit area and 31.6% by planting area expansion.Total yield increase relies mainly on yield increase per unit area.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher.
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Maize yield per unit area in China rose by 4 205.1 kg or 437.3% from 1949 to 2007.
- Outcome
- yield per unit areae0
- Direction
- increasede0
- Value
- 4 205.1 kg or 437.3%e0
- Qualifier
- from 1949 to 2007e0
- Setting
- Chinae0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize yield per unit area in China increased by 4 205.1 kg or 437.3% from 1949 to 2007”
Claim · model-written summary
Annual growth in maize yield per unit area was 85.84 kg/hm2.
Verbatim
e0“with annual growth rate of 85.84 kg/hm2”
t0“MaizeYield”
Claim · model-written summary
Total maize yield rose from 12.418 million tons to 152.30 million tons, a 12.3-fold increase.
Verbatim
e0“the total yield increased from 12.418 million tons to 152.30 million tons,an increase of 12.3 times”
t0“MaizeYield”
Claim · model-written summary
Yield increase per unit area contributed 68.4% of the total maize yield increase.
Not reportedDirection
Verbatim
e0“the total yield increased from 12.418 million tons to 152.30 million tons,an increase of 12.3 times,of which 68.4% was contributed by yield increase per unit area”
t0“MaizeYield”
Claim · model-written summary
Planting area expansion contributed 31.6% of total maize yield increase.
Not reportedDirection
Verbatim
e0“31.6% by planting area expansion.Total yield increase relies mainly on yield increase per unit area”
t0“MaizeYield”