Impact of the Cropping Systems of a Minor Dry Season on the Growth, Yields and Nitrogen Uptake of Maize (Zea mays
 L) Grown in the Humid Tropics during the Major Rainy Season

Reproductive data from 24 does (Chinchilla X New Zealand White) of twenty weeks, were analyzed to determine the effect of generation, housing systems and season on the reproductive performance of rabbits raised in the humid tropics. The experiment was carried out during four seasons namely: early dry season (EDS-September to November), late dry season (LDS-December to February), early rainy season (ERS-March to May) and late rainy season (LRS-June to August). The study was repeated in the second generation and the data obtained were subjected to analysis of variance in a 2x2x4 factorial arrangement. Factors considered were generations, housing systems, and seasons respectively. Highest breeding efficiency of 83.33% was obtained in the first generation and maximum litter size at birth (35) and weaning (28) were observed in caged-does that kindled in EDS of first and second generations respectively, while does housed on deep litter system produced the smallest litter size at birth (24) and weaning (18) in the ERS of the second generation. Highest (12) and least (4) pre-weaning losses were recorded in caged-does that kindled in ERS of the first and second generation respectively, whereas highest average birth weight (120.58g) was observed in litters of deep litter-does that kindled in EDS of the second generation. These results indicated that the production of rabbits for breeding purposes is better achieved during early dry season (September-November) and also revealed that deep litter system allows satisfactory performance and has comparative advantage over wooden cage system considering the reduction in housing cost and can be used to improve the nutritional status of the family and also to obtain some supplementary income.

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Long-term Productivity of Intensive Rice Cropping Systems on the Central Plain of Thailand

Experimental Agriculture ◽

10.1017/s0014479700008061 ◽

1977 ◽

Vol 13 (4) ◽

pp. 305-315 ◽

Cited By ~ 10

Author(s):

J. J. Walcott ◽

M. Chauviroj ◽

A. Chinchest ◽

P. Choticheuy ◽

R. Ferraris ◽

...

Keyword(s):

Grain Yield ◽

Short Duration ◽

Nitrogen Uptake ◽

Nitrogen Fertilizer ◽

Dry Matter ◽

Cropping Systems ◽

Dry Season ◽

Multiple Cropping ◽

Rice Cropping Systems

SUMMARYThe productivity of seven multiple rice-cropping systems, utilizing a short-duration cultivar under irrigation, were assessed over 5 years. Systems of one, two and three crops a year were compared. Multiple cropping reduced grain yield, panicles m-2, total dry matter and nitrogen uptake per crop. However, the unfertilized three-crop-per-year system averaged 9·1 t grain, 17·1 t DM and 126 kg N ha-1 per annum, without showing a long term decline in productivity. Recovery and utilization of nitrogen fertilizer were generally low compared to other experiments, and were highest for the early dry season cropping period.

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