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This article reports on and analyzes long-term projections of world food requirements compared with observed 2000 data reported by the United Nations’ Food and Agriculture Organization. The importance of this “post-mortem” is to strengthen the case for carrying out long-term projections of essential resources—food, energy, and non-fuel minerals— because of the long-lead times needed to insure that adequate global output levels of these basic ingredients of living standards will be met. This study should prove useful to those preparing today’s long-term projections, with world population projected to rise to over 9bn by mid-century.
We investigated the feasibility of using ammonium- and potassium-loaded
zeolite (NK-Z) as carriers for fertilizer and for slow release of nitrogen (N)
and potassium (K). Plant growth response and soil analysis were performed. The
results indicated an increase in the total harvest weight of kale (Brassica
alboglabra Bailey). Furthermore, higher levels of N and K were detected in
soil applied with NK-Z than in soil applied with compound fertilizers. The leaf
fresh weight of kale in the fertilizer treatments including NK-Z were 2118.4
and 2111.3 g·plant-1, while the leaf fresh weights of kale in the treatment
without NK-Z was 2018.0 g·plant-1.
The N and K contents in the soils were maintained in the high level in the NK-Z
treatment compared that in control treatment. The results indicate that NK-Z
has a great potential as the slow-release fertilizer reducing pollution by
preventing leaching to the ground water.