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At present, the quality of silage corn is generally classified internationally based on nutrient composition, type of cellulose, and animal ex vivo experiments. Commonly used indicators include crude protein content, starch content, neutral and acidic detergent fiber content, lignin content, and Digestive power. Through the three-factor optimal saturation design, the SZF-06A crude fat analyzer was used to study the relationship between N, P and planting density and the crude fat of silage corn at different harvesting stages. The crude fat content of silage corn was also simulated by regression of 3 factors. The effect of yield provides a theoretical basis for the high yield and quality cultivation of silage maize.
Harvested in three periods, the SZF-06A crude fat analyzer determined that the effect of N, P and planting density on the crude fat content varied with the harvest period. In the loose-flying period, the crude fat content increased with the increase of N application rate, and the increase rate gradually decreased. With the increase of P application amount, it showed a downward trend, and the greater the application of P, the more significant the decline. The effect on the crude fat content was the smallest, and with the increase of the density, the crude fat content showed a decreasing trend, and the decreasing range gradually decreased.
In the SZF-06A crude fat analyzer, the results of the quadratic regression fitting of the results of the whole plant crude fat content at different harvest periods indicated that the crude fat content and the individual factors of N, P and planting density were not closely related. From the regression coefficient t test, it can be seen that there is no significant correlation between N and crude fat content during grain filling, and N and P interactions and N density interactions are not significantly related to crude fat content. During the milk-harvesting period, the N and P single factors had no significant correlation with the crude fat content; the N-density interaction had no significant correlation with the crude fat content.
Cultivation measures are important factors affecting the yield and quality of silage corn. The research results at home and abroad show that fertilization has a significant effect on the nutritional quality of corn kernels. In the response of the nutritional quality of silage corn to the density and fertilizer, the previous studies are not yet systematic, and the mechanism is not yet clear. The two important parameters in the evaluation of silage corn varieties are yield and quality. The evaluation of quality includes mainly crude protein, crude fat, and crude fiber, and these evaluation methods are not perfect. The determination of crude fat by the crude fat analyzer is currently the more commonly used method.