Experiências de adubação mineral e orgânica com Capim Kikuyu (Pennisetum clandestinum Hochst.)

Experiências de adubação mineral e orgânica com Capim Kikuyu (Pennisetum clandestinum Hochst.)^*

T. Coury, A. P. Torres; G. Ranzani

E. S. A. "Luiz de Queiroz", da Universidade de S. Paulo

ABSTRACT

Kikuio grass (Pennisetum clandestinum Hochst) is beyond any doubt, a pasture very important for farm animals; since its chemical composition is very similar to that of alfalfa, the present field trial was carried out; a randomized block design with 8 treatments was selected as follows:

1 N - P - K - Ca - Mg (complete manuring)

2 N - P - K - Ca----- (without Mg)

3 N - P - K-------Mg (without Ca)

4 ----P - K - Ca - Mg (without N)

5 N------K - Ca Mg (without P)

6 N - P - Ca - Mg (without K)

7 organic matter (without mineral fertilizers)

8 control

Nitrogen was applied as NaN03 (topdressed) and as ammonium sulfate; P2O5 was given as superphosphate associated to bonemeal; K2O was applied as muriate, CaO as "sambaquis" (oyster shells); MgO was given as MgSO4 (topdressed). The source of organic matter was farmyard manure.

As far yields are concerned the following observations were made:

1. treatment n. 7 was superior to all others;

2. considering the mineral fertilizers, good responses were due to N and P2O5;

3. the control yield was exceedingly poor, being inferior to all the others treatments; The chemical analyses revealed that:

1. the protein content decreased accordingly to this order: 7, 6, 5 and 1; treatment 4 (without N) gave the lowest protein content;

2. treatment n. 4 produced the highest fat content; treatment no. 7 ranked second; no. 8 gave the lowest fat content;

3. crude fiber: highest - treatment 7; lowest - 8;

4. ashes: the ashes content was higher in treatment 5; proprobably because the most abundant element in the ashes is K, the ash content of treatment 6 (no K) was very low;

5. non nitrogenous substances (determined by difference) - high in treatment 8 and low in treatment 7;

6. mineral elements in the ashes - the element omitted from a given treatment was very low in the grasses therein obtained; this shows the relative poverty of the soil in that element.

As general remark the Authors suggest the use of farmyard manure in the fertilization of Kikuio grass; farmyard manure could probably substitute wither green manure or compost.

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BIBLIOGRAFIA CONSULTADA

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*

Tese apresentada ao II Congresso Pan Americano de Agronomia em Abril de 1953. Piracicaba, E. S. Paulo.

14a. Secção Técnica Científica: - Pastagens e Plantas Forrageiras

Datas de Publicação

• Publicação nesta coleção
  28 Set 2012
• Data do Fascículo
  1956